[REFACTOR] Improved Language Detection

[Lissy93]

Category: Refactoring

Overview

• Makes the auto language detection algo smarter
• Improves responsiveness for the language selector form
• Also adds a tag to error handler, and a contents page to Config docs

Issue Number N/A

New Vars N/A

Screenshot N/A

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• Bumps version, if new feature added

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[viezly]

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