I checked the Help instructions on the respective page at Phoca that says:
I did all that and the files are FTPed in the right locations, but still all gallery sites are in EnglishHow to install language pack in Joomla!
Some component language packs cannot be installed in Extension Manager (e.g. because they don't include XML setup file). In such case, they need to be installed manually.
See the following example (German language pack for Phoca Gallery component), how to install language pack manually:
Download German language ZIP pack and unzip it. You should get two files:
de-DE.com_phocagallery.ini
de-DE.com_phocagallery.menu.ini
Copy both files into the following destination:
administrator/language/de-DE/ folder and
language/de-DE/ folder on your server.
If the German language is active (admin, front) on your Joomla! site, then the Phoca Gallery component will be translated to German.
Has anyone any ideas?
Thanks

