Hi,
we use a Raspberry installation AND FreePBX 2.11
The installation was uncomplicated. To understand the system it make sence to chance the languge at the admin panel 
But this is not so easy ;-(
We recocnised the button in the right corner (language) - to select german etc…
But if we change this nothing happends. After reload everything is in english.
We have install some languages like de_DE-Utf8 and others ans selected de_DE-Uft8 as normal lang.
So what is the problem? THX for help.