Made translation into Russian for the plugin.
Created a folder /languages it created a file translation testimonial_rotator-ru_RU.po and testimonial_rotator-ru_RU.mo (looked resource file, there specified TEXTDOMAIN 'testimonial_rotator', tried to save as testimonial-rotator-ru_RU.po and testimonial-rotator-ru_RU.mo.
Also no effect. Anyway all in English. Use programs poEdit.
What could be the problem?
By the way, plugin Awesome Weather translated without problems.