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If you face problems with translation, you need to make sure that your translation files are synchronized. Button Sync (Loco Translate plugin http://prntscr.com/glemdq) allows you to synchronize your translation file with updated pot file. It means if we made any changes in template files that may affect translation or we added new string for the translation and you updated theme you need to synchronize your translation with updated files. Only after synchronization, you’ll be able to translate new strings or strings that were changed. Also, don’t forget to backup all the files before any update.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.