Pass current language into Jitsi

Jitsi itself now uses the current language of the user. However, this does not yet apply to the welcome page of the Jitsi widget that says "Join conference", which is only hard-coded to
english for now.

Signed-off-by: Oliver Sand <[email protected]>

Author: Fox32

src/vector/jitsi/index.ts

@@ -57,6 +57,7 @@ let roomName: string;
 let startAudioOnly: boolean;
 let isVideoChannel: boolean;
 let supportsScreensharing: boolean;
+let language: string;
 
 let widgetApi: WidgetApi;
 let meetApi: any; // JitsiMeetExternalAPI
@@ -86,6 +87,7 @@ const setupCompleted = (async (): Promise<string | void> => {
         const parentUrl = qsParam("parentUrl", true);
         const widgetId = qsParam("widgetId", true);
         const theme = qsParam("theme", true);
+        language = qsParam("language", true) ?? "en";
 
         if (theme) {
             document.body.classList.add(`theme-${theme.replace(" ", "_")}`);
@@ -371,6 +373,7 @@ function joinConference(audioInput?: string | null, videoInput?: string | null):
             apiLogLevels: ["warn", "error"],
         } as any,
         jwt: jwt,
+        lang: language,
     };
 
     // Video channel widgets need some more tailored config options