Add issue about limited translations of Tor Browser

wiki/src/news/version_1.2.mdwn

@@ -47,6 +47,9 @@ for technical details.
 
 # Known issues
 
+* Tor Browser is translated in [[15
+  languages only|support/known_issues#browser_languages]].
+
 * [[Longstanding|support/known_issues]] known issues.
 
 # I want to try it or to upgrade!

wiki/src/support/known_issues.mdwn

@@ -339,3 +339,13 @@ Tor Browser takes too long to shutdown
 Since Tails 0.22, the browser sometimes takes too long to shutdown
 ([[!tails_ticket 6480]]). Waiting a few more seconds is usually enough
 to let it close itself correctly.
+
+<a id="browser_languages"></a>
+
+Tor Browser is translated in a limited number of languages
+----------------------------------------------------------
+
+Since Tails 1.2, the web browser is based on Tor Browser which is
+translated in less languages than before. You can see the list of
+languages available in Tor Browser from the [Tor Browser
+homepage](https://www.torproject.org/projects/torbrowser.html.en).