diff --git a/l10n/de.json b/l10n/de.json
new file mode 100644
index 0000000..76f506e
--- /dev/null
+++ b/l10n/de.json
@@ -0,0 +1,35 @@
+{
+    "translations": {
+        "The following meeting will be added to your Nextcloud Calendar.": "Das folgende Meeting wird zu deinem Nextcloud-Kalender hinzugefügt.",
+        "This request came from an external link. Only continue if you trust its source.": "Diese Anfrage stammt von einem externen Link. Fahre nur fort, wenn du der Quelle vertraust.",
+        "Title": "Titel",
+        "Description": "Beschreibung",
+        "Start": "Beginn",
+        "End": "Ende",
+        "Organizer": "Organisator",
+        "Location": "Ort",
+        "Link": "Link",
+        "Calendar": "Kalender",
+        "Add to Nextcloud Calendar": "Zum Nextcloud-Kalender hinzufügen",
+        "Cancel": "Abbrechen",
+        "Meeting title is required.": "Ein Meeting-Titel ist erforderlich.",
+        "Meeting title is too long.": "Der Meeting-Titel ist zu lang.",
+        "Meeting title contains invalid characters.": "Der Meeting-Titel enthält ungültige Zeichen.",
+        "Meeting description is too long.": "Die Meeting-Beschreibung ist zu lang.",
+        "Meeting description contains invalid characters.": "Die Meeting-Beschreibung enthält ungültige Zeichen.",
+        "Invalid date/time.": "Ungültiges Datum / ungültige Uhrzeit.",
+        "End time must be after start time.": "Die Endzeit muss nach der Startzeit liegen.",
+        "Location is too long.": "Der Ort ist zu lang.",
+        "Location contains invalid characters.": "Der Ort enthält ungültige Zeichen.",
+        "Location must be an HTTPS URL.": "Der Ort muss eine HTTPS-URL sein.",
+        "Meeting URL is too long.": "Die Meeting-URL ist zu lang.",
+        "Meeting URL contains invalid characters.": "Die Meeting-URL enthält ungültige Zeichen.",
+        "Meeting URL must be an HTTPS URL.": "Die Meeting-URL muss eine HTTPS-URL sein.",
+        "Organizer email address is too long.": "Die E-Mail-Adresse des Organisators ist zu lang.",
+        "Organizer contains invalid characters.": "Der Organisator enthält ungültige Zeichen.",
+        "Invalid organizer email address.": "Ungültige E-Mail-Adresse des Organisators.",
+        "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.": "In deinem Konto wurde kein beschreibbarer Kalender gefunden. Erstelle einen in der Nextcloud-Kalender-App und versuche es erneut.",
+        "The selected calendar is no longer writable. Pick another one and try again.": "Der ausgewählte Kalender ist nicht mehr beschreibbar. Wähle einen anderen aus und versuche es erneut."
+    },
+    "pluralForms": "nplurals=2; plural=(n != 1);"
+}
diff --git a/l10n/de_DE.json b/l10n/de_DE.json
new file mode 100644
index 0000000..3003f32
--- /dev/null
+++ b/l10n/de_DE.json
@@ -0,0 +1,35 @@
+{
+    "translations": {
+        "The following meeting will be added to your Nextcloud Calendar.": "Das folgende Meeting wird zu Ihrem Nextcloud-Kalender hinzugefügt.",
+        "This request came from an external link. Only continue if you trust its source.": "Diese Anfrage stammt von einem externen Link. Fahren Sie nur fort, wenn Sie der Quelle vertrauen.",
+        "Title": "Titel",
+        "Description": "Beschreibung",
+        "Start": "Beginn",
+        "End": "Ende",
+        "Organizer": "Organisator",
+        "Location": "Ort",
+        "Link": "Link",
+        "Calendar": "Kalender",
+        "Add to Nextcloud Calendar": "Zum Nextcloud-Kalender hinzufügen",
+        "Cancel": "Abbrechen",
+        "Meeting title is required.": "Ein Meeting-Titel ist erforderlich.",
+        "Meeting title is too long.": "Der Meeting-Titel ist zu lang.",
+        "Meeting title contains invalid characters.": "Der Meeting-Titel enthält ungültige Zeichen.",
+        "Meeting description is too long.": "Die Meeting-Beschreibung ist zu lang.",
+        "Meeting description contains invalid characters.": "Die Meeting-Beschreibung enthält ungültige Zeichen.",
+        "Invalid date/time.": "Ungültiges Datum / ungültige Uhrzeit.",
+        "End time must be after start time.": "Die Endzeit muss nach der Startzeit liegen.",
+        "Location is too long.": "Der Ort ist zu lang.",
+        "Location contains invalid characters.": "Der Ort enthält ungültige Zeichen.",
+        "Location must be an HTTPS URL.": "Der Ort muss eine HTTPS-URL sein.",
+        "Meeting URL is too long.": "Die Meeting-URL ist zu lang.",
+        "Meeting URL contains invalid characters.": "Die Meeting-URL enthält ungültige Zeichen.",
+        "Meeting URL must be an HTTPS URL.": "Die Meeting-URL muss eine HTTPS-URL sein.",
+        "Organizer email address is too long.": "Die E-Mail-Adresse des Organisators ist zu lang.",
+        "Organizer contains invalid characters.": "Der Organisator enthält ungültige Zeichen.",
+        "Invalid organizer email address.": "Ungültige E-Mail-Adresse des Organisators.",
+        "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.": "In Ihrem Konto wurde kein beschreibbarer Kalender gefunden. Erstellen Sie einen in der Nextcloud-Kalender-App und versuchen Sie es erneut.",
+        "The selected calendar is no longer writable. Pick another one and try again.": "Der ausgewählte Kalender ist nicht mehr beschreibbar. Wählen Sie einen anderen aus und versuchen Sie es erneut."
+    },
+    "pluralForms": "nplurals=2; plural=(n != 1);"
+}
diff --git a/l10n/en.json b/l10n/en.json
new file mode 100644
index 0000000..1defbc3
--- /dev/null
+++ b/l10n/en.json
@@ -0,0 +1,35 @@
+{
+    "translations": {
+        "The following meeting will be added to your Nextcloud Calendar.": "The following meeting will be added to your Nextcloud Calendar.",
+        "This request came from an external link. Only continue if you trust its source.": "This request came from an external link. Only continue if you trust its source.",
+        "Title": "Title",
+        "Description": "Description",
+        "Start": "Start",
+        "End": "End",
+        "Organizer": "Organizer",
+        "Location": "Location",
+        "Link": "Link",
+        "Calendar": "Calendar",
+        "Add to Nextcloud Calendar": "Add to Nextcloud Calendar",
+        "Cancel": "Cancel",
+        "Meeting title is required.": "Meeting title is required.",
+        "Meeting title is too long.": "Meeting title is too long.",
+        "Meeting title contains invalid characters.": "Meeting title contains invalid characters.",
+        "Meeting description is too long.": "Meeting description is too long.",
+        "Meeting description contains invalid characters.": "Meeting description contains invalid characters.",
+        "Invalid date/time.": "Invalid date/time.",
+        "End time must be after start time.": "End time must be after start time.",
+        "Location is too long.": "Location is too long.",
+        "Location contains invalid characters.": "Location contains invalid characters.",
+        "Location must be an HTTPS URL.": "Location must be an HTTPS URL.",
+        "Meeting URL is too long.": "Meeting URL is too long.",
+        "Meeting URL contains invalid characters.": "Meeting URL contains invalid characters.",
+        "Meeting URL must be an HTTPS URL.": "Meeting URL must be an HTTPS URL.",
+        "Organizer email address is too long.": "Organizer email address is too long.",
+        "Organizer contains invalid characters.": "Organizer contains invalid characters.",
+        "Invalid organizer email address.": "Invalid organizer email address.",
+        "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.": "No writable calendar was found in your account. Create one in the Nextcloud Calendar app, then try again.",
+        "The selected calendar is no longer writable. Pick another one and try again.": "The selected calendar is no longer writable. Pick another one and try again."
+    },
+    "pluralForms": "nplurals=2; plural=(n != 1);"
+}
diff --git a/lib/Controller/CalendarController.php b/lib/Controller/CalendarController.php
index 528d560..ad03152 100644
--- a/lib/Controller/CalendarController.php
+++ b/lib/Controller/CalendarController.php
@@ -19,6 +19,7 @@ use OCP\IRequest;
 use OCP\IURLGenerator;
 use OCP\IUserSession;
 use OCP\IDateTimeZone;
+use OCP\IL10N;
 use Sabre\VObject\Reader;
 
 class CalendarController extends Controller
@@ -60,6 +61,7 @@ class CalendarController extends Controller
     private IUserSession $userSession;
     private IURLGenerator $urlGenerator;
     private IDateTimeZone $dateTimeZone;
+    private IL10N $l10n;
 
     public function __construct(
         string $appName,
@@ -68,7 +70,8 @@ class CalendarController extends Controller
         IAppManager $appManager,
         IUserSession $userSession,
         IURLGenerator $urlGenerator,
-        IDateTimeZone $dateTimeZone
+        IDateTimeZone $dateTimeZone,
+        IL10N $l10n
     ) {
         parent::__construct($appName, $request);
 
@@ -77,6 +80,7 @@ class CalendarController extends Controller
         $this->userSession = $userSession;
         $this->urlGenerator = $urlGenerator;
         $this->dateTimeZone = $dateTimeZone;
+        $this->l10n = $l10n;
     }
 
     /**
@@ -181,11 +185,15 @@ class CalendarController extends Controller
                 $calendars,
                 $calendarId,
                 $calendars === []
-                    ? 'No writable calendar was found in your account. '
-                    . 'Create one in the Nextcloud Calendar app, '
-                    . 'then try again.'
-                    : 'The selected calendar is no longer writable. '
-                    . 'Pick another one and try again.'
+                    ? $this->l10n->t(
+                        'No writable calendar was found in your account. '
+                        . 'Create one in the Nextcloud Calendar app, '
+                        . 'then try again.'
+                    )
+                    : $this->l10n->t(
+                        'The selected calendar is no longer writable. '
+                        . 'Pick another one and try again.'
+                    )
             );
         }
 
@@ -303,6 +311,7 @@ class CalendarController extends Controller
                 'location' => $data['location'],
                 'url' => $data['url'],
                 'error' => $error,
+                'l10n' => $this->l10n,
                 'calendars' => array_map(
                     static function (ICreateFromString $calendar): array {
                         return [
@@ -404,31 +413,31 @@ class CalendarController extends Controller
 
         if ($summary === '') {
             throw new \InvalidArgumentException(
-                'Meeting title is required.'
+                $this->l10n->t('Meeting title is required.')
             );
         }
 
         if (mb_strlen($summary) > 255) {
             throw new \InvalidArgumentException(
-                'Meeting title is too long.'
+                $this->l10n->t('Meeting title is too long.')
             );
         }
 
         $this->assertClean(
             $summary,
-            'Meeting title contains invalid characters.'
+            $this->l10n->t('Meeting title contains invalid characters.')
         );
 
         if ($description !== '' && mb_strlen($description) > 10000) {
             throw new \InvalidArgumentException(
-                'Meeting description is too long.'
+                $this->l10n->t('Meeting description is too long.')
             );
         }
 
         if ($description !== '') {
             $this->assertClean(
                 $description,
-                'Meeting description contains invalid characters.',
+                $this->l10n->t('Meeting description contains invalid characters.'),
                 true
             );
         }
@@ -438,7 +447,7 @@ class CalendarController extends Controller
 
         if ($endDate <= $startDate) {
             throw new \InvalidArgumentException(
-                'End time must be after start time.'
+                $this->l10n->t('End time must be after start time.')
             );
         }
 
@@ -446,37 +455,37 @@ class CalendarController extends Controller
             $this->assertBoundedLength(
                 $location,
                 self::MAX_URL_LENGTH,
-                'Location is too long.'
+                $this->l10n->t('Location is too long.')
             );
             $this->assertClean(
                 $location,
-                'Location contains invalid characters.'
+                $this->l10n->t('Location contains invalid characters.')
             );
-            $this->assertHttpsUrl($location, 'Location must be an HTTPS URL.');
+            $this->assertHttpsUrl($location, $this->l10n->t('Location must be an HTTPS URL.'));
         }
 
         if ($url !== '') {
             $this->assertBoundedLength(
                 $url,
                 self::MAX_URL_LENGTH,
-                'Meeting URL is too long.'
+                $this->l10n->t('Meeting URL is too long.')
             );
             $this->assertClean(
                 $url,
-                'Meeting URL contains invalid characters.'
+                $this->l10n->t('Meeting URL contains invalid characters.')
             );
-            $this->assertHttpsUrl($url, 'Meeting URL must be an HTTPS URL.');
+            $this->assertHttpsUrl($url, $this->l10n->t('Meeting URL must be an HTTPS URL.'));
         }
 
         if ($organizer !== '') {
             $this->assertBoundedLength(
                 $organizer,
                 self::MAX_EMAIL_LENGTH,
-                'Organizer email address is too long.'
+                $this->l10n->t('Organizer email address is too long.')
             );
             $this->assertClean(
                 $organizer,
-                'Organizer contains invalid characters.'
+                $this->l10n->t('Organizer contains invalid characters.')
             );
 
             if (!filter_var(
@@ -484,7 +493,7 @@ class CalendarController extends Controller
                 FILTER_VALIDATE_EMAIL
             )) {
                 throw new \InvalidArgumentException(
-                    'Invalid organizer email address.'
+                    $this->l10n->t('Invalid organizer email address.')
                 );
             }
         }
@@ -552,7 +561,7 @@ class CalendarController extends Controller
 
         if ($date === false) {
             throw new \InvalidArgumentException(
-                'Invalid date/time.'
+                $this->l10n->t('Invalid date/time.')
             );
         }
 
diff --git a/templates/confirm.php b/templates/confirm.php
index 90150f4..c630f46 100644
--- a/templates/confirm.php
+++ b/templates/confirm.php
@@ -9,6 +9,8 @@ $h = static function (string $value): string {
         'UTF-8'
     );
 };
+
+$l = $_['l10n'];
 ?>
 
 <div id="app-content">
@@ -21,13 +23,17 @@ $h = static function (string $value): string {
             </h1>
 
             <p class="atocal-intro">
-                The following meeting will be added to your
-                Nextcloud Calendar.
+                <?= $h($l->t(
+                    'The following meeting will be added to your '
+                    . 'Nextcloud Calendar.'
+                )) ?>
             </p>
 
             <p class="atocal-notice">
-                This request came from an external link.
-                Only continue if you trust its source.
+                <?= $h($l->t(
+                    'This request came from an external link. '
+                    . 'Only continue if you trust its source.'
+                )) ?>
             </p>
 
             <?php if ($_['error'] !== ''): ?>
@@ -39,13 +45,13 @@ $h = static function (string $value): string {
             <div class="atocal-details">
 
                 <div class="atocal-row">
-                    <strong>Title</strong>
+                    <strong><?= $h($l->t('Title')) ?></strong>
                     <span><?= $h($_['summary']) ?></span>
                 </div>
 
                 <?php if ($_['description'] !== ''): ?>
                     <div class="atocal-row">
-                        <strong>Description</strong>
+                        <strong><?= $h($l->t('Description')) ?></strong>
                         <span class="description">
                             <?= nl2br($h($_['description'])) ?>
                         </span>
@@ -53,25 +59,25 @@ $h = static function (string $value): string {
                 <?php endif; ?>
 
                 <div class="atocal-row">
-                    <strong>Start</strong>
+                    <strong><?= $h($l->t('Start')) ?></strong>
                     <span><?= $h(str_replace('T', ' ', $_['start'])) ?></span>
                 </div>
 
                 <div class="atocal-row">
-                    <strong>End</strong>
+                    <strong><?= $h($l->t('End')) ?></strong>
                     <span><?= $h(str_replace('T', ' ', $_['end'])) ?></span>
                 </div>
 
                 <?php if ($_['organizer'] !== ''): ?>
                     <div class="atocal-row">
-                        <strong>Organizer</strong>
+                        <strong><?= $h($l->t('Organizer')) ?></strong>
                         <span><?= $h($_['organizer']) ?></span>
                     </div>
                 <?php endif; ?>
 
                 <?php if ($_['location'] !== ''): ?>
                     <div class="atocal-row">
-                        <strong>Location</strong>
+                        <strong><?= $h($l->t('Location')) ?></strong>
                         <span>
                             <a
                                 href="<?= $h($_['location']) ?>"
@@ -86,7 +92,7 @@ $h = static function (string $value): string {
 
                 <?php if ($_['url'] !== '' && $_['url'] !== $_['location']): ?>
                     <div class="atocal-row">
-                        <strong>Link</strong>
+                        <strong><?= $h($l->t('Link')) ?></strong>
                         <span>
                             <a
                                 href="<?= $h($_['url']) ?>"
@@ -108,7 +114,7 @@ $h = static function (string $value): string {
                 <?php if ($_['calendars'] !== []): ?>
                     <div class="atocal-row">
                         <label for="atocal-calendar">
-                            <strong>Calendar</strong>
+                            <strong><?= $h($l->t('Calendar')) ?></strong>
                         </label>
                         <select id="atocal-calendar" name="calendarId">
                             <?php foreach ($_['calendars'] as $calendar): ?>
@@ -177,14 +183,14 @@ $h = static function (string $value): string {
                         type="submit"
                         class="primary"
                     >
-                        Add to Nextcloud Calendar
+                        <?= $h($l->t('Add to Nextcloud Calendar')) ?>
                     </button>
 
                     <a
                         href="<?= $h($_['cancelUrl']) ?>"
                         class="secondary"
                     >
-                        Cancel
+                        <?= $h($l->t('Cancel')) ?>
                     </a>
 
                 </div>