Normalize language code comparisons

Due to using the browsers' preferred languages by default, there was a possibility that the preferred language codes did not match any extension/source language, which lead to broken filtering.

While this happened, it was also possible that the preferred languages still matched properly to a language in the language filter, which caused confusion.
This was the case e.g., for "en-GB" or "en-US"

src/modules/core/utils/Languages.ts

@@ -75,6 +75,10 @@ export const toUniqueLanguageCodes = (codes: string[]): string[] => {
         .map(([, languagesOfIsoCode]) => languagesOfIsoCode![0].orgCode);
 };
 
+export const toComparableLanguage = (code: string): string => getLanguage(code).isoCode;
+
+export const toComparableLanguages = (codes: string[]): string[] => codes.map(toComparableLanguage);
+
 function defaultNativeLang(): readonly string[] {
     const preferredLanguages = toUniqueLanguageCodes([...navigator.languages]);