Hello
as far as i know its not possible to keep the cb bilingual. Only in a new installation CB follows the language settings in Joomla. When installing CB on a running site, it doesnt recognize these settings.
Then you have to change the language files manually. Go to this directory:
components/com_comprofiler/plugin/language/default_language/
the matter of concern are these files:
default_language.php
default_language.xml
save the files with another name.
copy the new german language files into the directory. The file names should be like
german.php
german.xml
When preferring the german informal language file (This is for the german "DU" instead of the german "SIE") then the filenames are
germani.php
germani.xml
Now rename the german language files into
default_language.php
default_language.xml
With this manual modification you will see the default language files in the plugin Manager of CB still displayed as englisch, but your CB on your website now will perform german communication.
In the same way you have to change the files for the FireBoard Forum, just in case you have it in combination with CB. Look for the directory of the language files, get the german files from the homepage of Fireboard or some remository in the web and change the existing files into the german ones.
Thats it.
regards
Tom