I tried to translate the theme in german language. I did everything like you wrote it in the documentation. I used Poedit etc.
But there are still many things “categories”, “Cart” and so on in english. I don’t know what the problem is. Please help me.
Site URL: hidden Theme version: 2.1 WooCommerce version: 3.3.3
Likely you just need to synchronize translation files.
Before this make sure that you placed translation files into wp-content/languages/themes folder with correct name http://xstore.helpscoutdocs.com/article/30-base-theme-translation (the same for classsico theme).
Button Sync allows you to synchronize your translation file with updated pot file. It means if we made any changes in template files that may affect transaltion 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. You may lose only strings that were changed.
Also, don’t forget to backup all the files before any update.
To translate “categories” in sidebar, you need to add category widget in Appearance > Widgets > Shop Sidebar > and write title on your language http://prntscr.com/ijt92m