Update res/values-fr/account_editor.xml
Update res/values-fr/legacy.xml
Update res/values-fr/muc_editor.xml

In the context of a chat application, the French translation for 'nickname' is not 'surnom'. 'Pseudo' (short for 'pseudonyme') is a much more common usage.
Update res/values-fr/status_editor.xml
Update res/values-fr/status_editor.xml
More typos fixed
Merge pull request #1 from liotier/master

Tiny typos and extremely minor improvements in French translations