As a site admin, I want i18n for settings pages, so that I can know what it says

### 📝 Description

The current version of the settings pages are a big mish-mash of both swedish and english. This should be changed

### ✅ Acceptance Criteria

- [ ] Add i18n variables for settings pages
- [ ] Localize settings pages

### 💡 Additional context

_No response_

Start by locating the settings-page entry points and reviewing how Swedish and English strings are currently rendered. Identify the localization mechanism used by the project, add translation variables for every settings-page string, and verify that the pages no longer mix languages.

Written by the indexing model from the issue text.