Through the use of this plugin I've discovered that there are many places where localization keys are looked up that stay untranslated, but have a potential to break functionality if they ever will be translated. This could happen when someone introduces UI functionality that happens to use the same keys.
Sticking out are
- redirect (many pages)
- form-date (almost every page)
- tabs1 (Control Panel, where used for tabs, e.g. Site/People/Membership or ControlPanel/Configuration/Server Administration)
Example screenshot, showing "redirect" translation here: https://liferay.dev/documents/portlet_file_entry/14/Screenshot_2019-12-19+Users+and+Organizations+-+Control+Panel+-+Liferay+DXP+7+2+FP3.png/53ed6d86-1b96-631a-ef97-cae547cbabf5?download=true (or, if that URL is too long and formatting gets mangled: Check attachment for this message https://liferay.dev/forums/-/message_boards/view_message/118126759)