add email validator

- show new meeting button only if the room parameter is not provided

launch.html

@@ -241,7 +241,7 @@
             Open meeting
           </button>
           
-          <button id="createNewFromLauncherButton" class="button secondary" type="button" data-i18n="creator.createNewButton">
+          <button id="createNewFromLauncherButton" class="button secondary hidden" type="button" data-i18n="creator.createNewButton">
             Create New Meeting
           </button>
         </div>
@@ -277,12 +277,11 @@
           <!-- Windows -->
           <div id="windowsDownload" class="download hidden">
             <h2 data-i18n="downloads.windows.title">
-              Jitsi Meet for Windows
+              Jitsi Meet for Microsoft Windows
             </h2>
 
             <p data-i18n="downloads.windows.description">
-              Install the Jitsi Meet desktop client and then try opening the
+              Install the Jitsi Meet desktop client and then try opening the meeting again.
-              meeting again.
             </p>
 
             <a id="windowsLink" class="button secondary" target="_blank" rel="noopener noreferrer" data-i18n="downloads.windows.button">
@@ -293,12 +292,11 @@
           <!-- macOS -->
           <div id="macosDownload" class="download hidden">
             <h2 data-i18n="downloads.macos.title">
-              Jitsi Meet for macOS
+              Jitsi Meet for Apple macOS
             </h2>
 
             <p data-i18n="downloads.macos.description">
-              Install the Jitsi Meet desktop client and then try opening the
+              Install the Jitsi Meet desktop client and then try opening the meeting again.
-              meeting again.
             </p>
 
             <a id="macosLink" class="button secondary" target="_blank" rel="noopener noreferrer" data-i18n="downloads.macos.button">
@@ -306,7 +304,22 @@
             </a>
           </div>
 
-          <!-- Linux / unbekannt -->
+          <!-- Linux -->
+          <div id="linuxDownload" class="download hidden">
+            <h2 data-i18n="downloads.linux.title">
+              Jitsi Meet for Linux
+            </h2>
+
+            <p data-i18n="downloads.linux.description">
+              Install the Jitsi Meet desktop client and then try opening the meeting again.
+            </p>
+
+            <a id="linuxLink" class="button secondary" target="_blank" rel="noopener noreferrer" data-i18n="downloads.linux.button">
+              Download Jitsi for Linux
+            </a>
+          </div>
+
+          <!-- unknown -->
           <div id="otherDownload" class="download hidden">
             <h2 data-i18n="downloads.other.title">
               Jitsi Meet Desktop
@@ -350,7 +363,7 @@
           </div>
 
           <div style="margin-top: 24px;">
-            <button id="createNewMeetingButton" class="button primary" type="button" data-i18n="creator.createNewButton">
+            <button id="createNewMeetingButton" class="button primary hidden" type="button" data-i18n="creator.createNewButton">
               Create New Meeting
             </button>
           </div>
@@ -416,7 +429,11 @@
 
       const CONFIG = {
         /* 
-         * Your Jitsi Domain.
+         * Your Jitsi Launcher domain
+         */
+        jitsiLauncher: "meet.bnvb.eu",
+        /*
+         * Your Jitsi domain.
          */
         jitsiHost: "meet.bnvb-ingenieure.de",
         /*
@@ -429,7 +446,8 @@
          */
         downloads: {
           windows: "https://github.com/jitsi/jitsi-meet-electron/releases",
-          macos: "https://github.com/jitsi/jitsi-meet-electron/releases"
+          macos: "https://github.com/jitsi/jitsi-meet-electron/releases",
+          linux: "https://github.com/jitsi/jitsi-meet-electron/releases"
         }
       };
 
@@ -475,6 +493,13 @@
               button: "Download Jitsi for macOS"
             },
 
+            linux: {
+              title: "Jitsi Meet for Linux",
+              description:
+                "Install the Jitsi Meet desktop client and then try opening the meeting again.",
+              button: "Download Jitsi for Linux"
+            },
+
             other: {
               title: "Jitsi Meet Desktop",
               description:
@@ -511,7 +536,8 @@
             startTimeRequired: "Please select a start time",
             endTimeRequired: "Please select an end time",
             endAfterStart: "End time must be after start time",
-            organizerRequired: "Please enter an organizer email"
+            organizerRequired: "Please enter an organizer email",
+            organizerInvalid: "Please enter a valid organizer email address"
           }
         },
 
@@ -552,6 +578,13 @@
               button: "Jitsi für macOS herunterladen"
             },
 
+            linux: {
+              title: "Jitsi Meet für Linux",
+              description:
+                "Installiere den Jitsi Meet Desktop-Client und versuche anschließend erneut, das Meeting zu öffnen.",
+              button: "Jitsi für Linux herunterladen"
+            },
+
             other: {
               title: "Jitsi Meet Desktop",
               description:
@@ -589,7 +622,8 @@
             startTimeRequired: "Bitte wähle eine Startzeit",
             endTimeRequired: "Bitte wähle eine Endzeit",
             endAfterStart: "Die Endzeit muss nach der Startzeit liegen",
-            organizerRequired: "Bitte gib eine Organisator-E-Mail ein"
+            organizerRequired: "Bitte gib eine Organisator-E-Mail ein",
+            organizerInvalid: "Bitte gib eine gültige Organisator-E-Mail-Adresse ein"
           }
         },
 
@@ -630,6 +664,13 @@
               button: "Télécharger Jitsi pour macOS"
             },
 
+            linux: {
+              title: "Jitsi Meet pour Linux",
+              description:
+                "Installez le client bureau Jitsi Meet, puis essayez de rouvrir la réunion.",
+              button: "Télécharger Jitsi pour Linux"
+            },
+
             other: {
               title: "Jitsi Meet Desktop",
               description:
@@ -666,7 +707,8 @@
             startTimeRequired: "Veuillez sélectionner une heure de début",
             endTimeRequired: "Veuillez sélectionner une heure de fin",
             endAfterStart: "L'heure de fin doit être après l'heure de début",
-            organizerRequired: "Veuillez entrer un email d'organisateur"
+            organizerRequired: "Veuillez entrer un email d'organisateur",
+            organizerInvalid: "Veuillez entrer une adresse email d'organisateur valide"
           }
         }
       };
@@ -770,9 +812,11 @@
       const browserLink = document.getElementById("browserLink");
       const windowsDownload = document.getElementById("windowsDownload");
       const macosDownload = document.getElementById("macosDownload");
+      const linuxDownload = document.getElementById("linuxDownload");
       const otherDownload = document.getElementById("otherDownload");
       const windowsLink = document.getElementById("windowsLink");
       const macosLink = document.getElementById("macosLink");
+      const linuxLink = document.getElementById("linuxLink");
       const createNewMeetingButton = document.getElementById("createNewMeetingButton");
       const createNewFromLauncherButton = document.getElementById("createNewFromLauncherButton");
       
@@ -977,6 +1021,7 @@
 
         windowsDownload.classList.add("hidden");
         macosDownload.classList.add("hidden");
+        linuxDownload.classList.add("hidden");
         otherDownload.classList.add("hidden");
 
         /* Windows */
@@ -993,6 +1038,13 @@
           return;
         }
 
+        /* Linux */
+        if (os === "linux") {
+          linuxLink.href = CONFIG.downloads.linux;
+          linuxDownload.classList.remove("hidden");
+          return;
+        }
+
         /* Alles andere */
         otherDownload.classList.remove("hidden");
       }
@@ -1135,7 +1187,7 @@
       function generateICS(meetingName, description, startTime, endTime, organizer) {
         /* Generate a unique room name from the meeting name */
         const roomName = meetingName.toLowerCase().replace(/\s+/g, '-').replace(/[^a-z0-9-]/g, '');
-        const meetingUrl = `https://${CONFIG.jitsiHost}/launch.html?room=${encodeURIComponent(roomName)}`;
+        const meetingUrl = `https://${CONFIG.jitsiLauncher}/launch.html?room=${encodeURIComponent(roomName)}`;
         
         /* Format dates for ICS */
         const formatICSDate = (date) => {
@@ -1252,6 +1304,12 @@ END:VCALENDAR`;
           return;
         }
 
+        const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+        if (!emailPattern.test(organizer)) {
+          alert(getTranslation('creator.organizerInvalid') || 'Please enter a valid organizer email address');
+          return;
+        }
+
         /* Generate ICS */
         const icsData = generateICS(meetingName, description || meetingName, startTime, endTime, organizer);
         
@@ -1295,6 +1353,8 @@ END:VCALENDAR`;
          */
         if (!isValidRoom(room)) {
           invalidRoom.classList.remove("hidden");
+          /* Show the create new meeting button when no room is specified */
+          createNewMeetingButton.classList.remove("hidden");
           return;
         }
 
@@ -1313,6 +1373,11 @@ END:VCALENDAR`;
          */
         launcher.classList.remove("hidden");
         
+        /*
+         * Hide the "Create New Meeting" button when a valid room is specified
+         */
+        createNewFromLauncherButton.classList.add("hidden");
+
         /*
          * Debug-Informationen.
          */