Merge pull request #1322 from jitsi/livestream_help_link

livestream link help link

css/components/_link.scss

         text-decoration: underline;
         @include transition(color .1s ease-in);
     }
+}
+
+/**
+ * Helper links are links that are meant to open a documentation page or more
+ * detailed info.
+ */
+.helper-link {
+    @extend .link;
+    font-size: 12px;
 }

interface_config.js

     AUDIO_LEVEL_SECONDARY_COLOR: "rgba(255,255,255,0.2)",
     POLICY_LOGO: null,
     LOCAL_THUMBNAIL_RATIO: 16/9, //16:9
-    REMOTE_THUMBNAIL_RATIO: 1 //1:1
+    REMOTE_THUMBNAIL_RATIO: 1, //1:1
+    // Documentation reference for the live streaming feature.
+    LIVE_STREAMING_HELP_LINK: "https://jitsi.org/live"
 };

lang/main.json

         "failedToStart": "Live streaming failed to start",
         "buttonTooltip": "Start / Stop live stream",
         "streamIdRequired": "Please fill in the stream id in order to launch the live streaming.",
+        "streamIdHelp": "Where do I find this?",
         "error": "Live streaming failed. Please try again.",
         "busy": "All recorders are currently busy. Please try again later."
     }

modules/UI/recording/Recording.js

     const streamIdRequired
         = APP.translation.generateTranslationHTML(
             "liveStreaming.streamIdRequired");
+    const streamIdHelp
+        = APP.translation.generateTranslationHTML(
+            "liveStreaming.streamIdHelp");
 
     return new Promise(function (resolve, reject) {
         dialog = APP.UI.messageHandler.openDialogWithStates({
                     `<input  class="input-control"
                     name="streamId" type="text"
                     data-i18n="[placeholder]dialog.streamKey"
-                    autofocus>`,
+                    autofocus><div style="text-align: right">
+                    <a class="helper-link" target="_new" 
+                    href="${interfaceConfig.LIVE_STREAMING_HELP_LINK}">`
+                        + streamIdHelp
+                        + `</a></div>`,
                 persistent: false,
                 buttons: [
                     {title: cancelButton, value: false},