Thanks. That helped me a lot. As a matter of fact I was created .po and .mo files with Codestyling Localization plugin. The problem was that my country code should be in two letters. First solution was to create .po file with a poedit. Second solution is to rename .po file after translate it with a Codestyling plugin. Third solution is to keep Codestyling files as they are and change Polylang setting languages>locale from xx to xx_XX (x represents country code you are working on), also rename a flag file in the Polylang flags folder.
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