Load locale files at runtime

[JakobMiksch]

when building the application, the locale files are transpiled to the built. Therefore they cannot be changed later on, like it is possible for the app-conf-*.json files.

useful links:

• https://vue-i18n.intlify.dev/guide/advanced/lazy

[JakobMiksch]

Possible fix: replace require.context() in wegue/src/util/Locale.js (here and here) with a function that reads the files on demand. Maybe import is useful here.

[fschmenger]

@JakobMiksch This is the spot where all language files get picked up by webpack from the folder structure. As a second step the application and Wegue specific language files are merged into one big object.

Since one of the long term development goals is to separate Wegue and application code (e.g. deliver Wegue as a separate NPM package), IMO we should preserve the compile time packaging of Wegue core language files and only do dynamic loading for app language files.

The implementation steps are roughly as follows:

• The code loading the app specific language files (here) should be replaced by a dynamic loader according to https://vue-i18n.intlify.dev/guide/advanced/lazy.
• On the fly merge with the built-in Wegue language files should be executed after loading an app language file (implementation simliar to the deep merge in the existing code)
• On application start both app language files for the fallback language and the current language have to be loaded.