Hi @Truest, I can answer your first question:
The numbers you are seeing in the UI are related to the “verbose localization” feature. Details about how tit can be used to modify the user interface text of your site are here: Find a translation key with verbose localization. The most likely reason you are seeing the numbers is because you have enabled the “verbose localization” site setting:
Disabling the setting and refreshing the page should make the numbers go away.