Hi,
What is your joomla language? And what is its prefix?
(For example, English uses [n]/en-GB/[/n] , what does your language uses?)
Basically take the
/language/en-GB/en-GB.tpl_flexible_darkmart.ini
and upload to your own language sub-folder, then translate the lines in it.
For instance, for French, the .INI file should be uploaded to here:
/language/fr-FR/fr-FR.tpl_flexible_darkmart.ini
Regards,
Support