[REQUEST] Ability to override built-in strings

[liana-p]

Is your feature request related to a problem? Please describe.
The engine contains various built-in strings that can't be customised by games. For example title of skills popup, quest details etc.

Ideally all those strings should be configurable in some way

Describe the solution you'd like
Add new config keys in relevant config files to override various default strings contained in the engine, and make the engine use them if present

This will probably be an ongoing piece of work as there are many places with "hardcoded" strings, so anyone can do a small amount of them without needing to do all of them at once