Reader: localized filters (ReaderTag)

[mzorz]

Fixes #8069

This PR does a few things:

• first, it adds a locale param when fetching Reader Tags from the server /read/menu endpoint so the titles can be properly localized (68c2526)
• second, it forces a server call update when the user changes the app's language and makes sure to retrieve things in the right locale (d0bd21e)
• finally, given we take a default string for "Saved posts" from the app resources and append it to the Tag filter list in the database ReaderTagTable table, we're now also taking the Tag's title into account when comparing lists, to account for potential locale changes. (a5d6245)

BEFORE

AFTER

To test:

1. go to the Reader's tab and check the filters are all in the configured language.
2. go to the Me tab, then App Settings, then change your locale to something else
3. go back to the Reader's tab and check the filters are all in the newly configured language.

[theck13]