fix language strings in manifest so that translations are properly used

[small1]

Pull Request Template

Description

This fixes locale selection in the plugin.

Fixes #16

Checklist

• [x] My contributions and commit messages follows the style guidelines of this project
• [x] I have made corresponding changes to the documentation
• [x] New and existing unit tests pass locally with my changes
• [x] The Pull Request has an informative and human-readable title
• [x] Changes are limited to a single goal (avoid scope creep)
• [x] Code can be automatically merged (no conflicts)
• [x] I confirm that I have read any Contribution guidelines (CONTRIBUTING)
• [x] I confirm that I wrote and/or have the right to submit the contents of my PR, by agreeing to the Developer Certificate of Origin, by adding a 'sign-off' to my commits

[Ayko1595]

This unfortunately has some failing actions due to an early merge of a previous PR. I will merge this and merge the fix for the failing bug later today.

[Ayko1595]

Another thing to note is that the commit structure is: "{issue number}: Commit message"