* Fixed overrideFrequency to properly allow for floats with a minimum of 410 MHz and maximum of 930 MHz. Added 3 decimal point check.
* Removed duplicate error message in FormInput.tsx
* Added error message for overrideFrequency in several locales
* Simplified check and reverted translated languages to English besides German. Also fixed a typo in src/components/UI/Input.tsx.
* Let i18n handle fallback + linting
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Co-authored-by: philon- <jeremy@gallant.se>
