position => top|bottom does nothing since MediaWiki 1.29 (T109837). Since MLEB policy is to support two latest MediaWiki releases, it is now safe to remove this code for the following extensions:
- Babel
- Translate
- UniversalLanguageSelector
In addition I know the following extensions can also be updated:
- TwnMainPage
- ContentTranslation
The resource loader module definitions are usually found in extension.json, but some of them can be in PHP files too (e.g. Translate or those defined conditionally in hooks).
Possible places to check, (false positive possible):