feat: localization (#196)

* Started adding locale translations :)

* Added some more translations

* Working on translating even more pages

* More translations

* Added test default locale retrieval

* replace `intl.formatMessage` with custom `t` hook

* add more translations

* improve title syntax

* add more translations

* translate admin config page

* translated error messages

* add language selecter

* minor fixes

* improve language handling

* add upcoming languages

* add `crowdin.yml`

* run formatter

---------

Co-authored-by: Steve Tautonico <stautonico@gmail.com>

frontend/src/utils/string.util.ts

@@ -1,6 +1,5 @@
-export const configVariableToFriendlyName = (variable: string) => {
-  const splitted = variable.split(/(?=[A-Z])/).join(" ");
-  return splitted.charAt(0).toUpperCase() + splitted.slice(1);
+export const camelToKebab = (camelCaseString: string) => {
+  return camelCaseString.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase();
 };
 
 export const capitalizeFirstLetter = (string: string) => {