You will get an answer faster if post different questions via different topics. Different questions request different specialists from our team, so you may face a delay. I hope for your understanding.
1a. Please translation files of the theme into /wp-content/languages/themes/ folder, and of plugins – wp-content/languages/plugins folder.
After every update, you need to synchronize translation – https://xstore.helpscoutdocs.com/article/103-translation-files-update Sometimes new strings are added and only after synchronization, you’ll be able to translate new strings or strings that were changed. Not always, but some strings can be missing after the sync and you need to find and translate them one more time, this is independent of us and relates to WP functionality. Do not forget about XStore Core plugin which contains few strings visible of the frontend.
Also, do a backup of all the files before any update.
1b. Synchronize translation of the theme, Core plugin, and WooCommerce, then translate required strings.
2. Sorry, but your request is a bit unclear for me.
The next custom CSS code can be used to disable the text – http://prntscr.com/s9mt3f
