Update German translation

locales/de.json

@@ -479,5 +479,8 @@
     "Artist: ": "Künstler: ",
     "Album: ": "Album: ",
     "channel_tab_playlists_label": "Wiedergabelisten",
-    "channel_tab_channels_label": "Kanäle"
+    "channel_tab_channels_label": "Kanäle",
+    "Channel Sponsor": "Kanalsponsor",
+    "Standard YouTube license": "Standard YouTube-Lizenz",
+    "Song: ": "Musik: "
 }