No, this method is working fine for all other plugins. Make sure you name the translated files ucan-post-LANGUAGE.po and ucan-post-LANGUAGE.mo and put them in the /i18n/ folder.
Example the french language would be ucan-post-fr_FR.po and ucan-post-fr_FR.mo
Open the .POT file in Poedit, translate and then do a SAVE-AS, this will generate the .po and .mo files for you, don’t actually leave the .POT file translated.