for any other language just change the name language to your own
It is harmfull (not useless only) to ~just change the name~ of the language file.
If an administrator want to manage ads in his own language
then (besides the Ads.english.php or/and Ads.english-utf8.php files)
the special file with its translated content
should be included into the mod packet -
at least Ads.<language>.php OR Ads.<language>-utf8.php
or both ( Ads.<language>.php AND Ads.<language>-utf8.php )
(or all known language files simultaneously).