refactor: cleanup various problems

[TheGreatRefrigerator]

Fixes various issues reported by WebStorm to make error reporting more meaningful.

Typos in translation strings and parts with important and complex functionality were left out. (e.g. overlayer.. props like overlayerTileProviders used in config and hooks)

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
2.7% Duplication

[TheGreatRefrigerator]

The code smell Prefer using an optional chain expression instead, as it's more concise and easier to read. is a decent catch, but as it's not "new" code but adjusted, i would ignore that here and change to optional chain expressions repo wide some other time. The Todo and the duplications were only adjusted (typos or similar) as well, not introduced.