After updating to latest version of RTMEDIA, all translations stopped working. I uploaded language file again to a folder:
/www/wp-content/plugins/buddypress-media/languages
I uploaded both files just in case (rtmedia-fi_FI.mo and rtmedia-fi_FI.po).
Nothing happens! I hope that someone has some ideas how to help me 
@miikka, can you tell me what constant is set for ‘WPLANG’ in your wp_config.php file?
You can also submit your translation for rtMedia here -> https://rtcamp.com/translate/projects/rtmedia
Check this link for how to submit translations -> https://rtcamp.com/rtmedia-translation/
define(‘WPLANG’, ‘fi’);
I have tried: rtmedia-fi, rtmedia-fi_FI and rtmedia_fi. Nothing works 
@miikka, Can you please check whether it works properly by changing the WPLANG for other language?
Use this line to define WPLANG define(‘WPLANG’, ‘fi_FI’);
I tried define(‘WPLANG’, ‘fi_FI’);. Not working and it breakes all other plugins and theme-language files
I tried to change wplang to ro_RO … nothing happened, still in english.
This is very strange, because previous version of rtMedia worked perfectly with translations. Odd…
@miikka,
is only rtMedia translation not working or your whole site’s translation not working?
Also, check by deactivating rtMedia whether translation on your site works or not.