Added language selection (bitfireAT/davx5#137)

* added language selection

* PermissionsFragment: Hide notification permission switch on Android < 13

* Retrieve locales with a function

* Added locales flavoring

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Moved locales functions to `locales.gradle`

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Added `locales_config.xml` generation

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Now gets generated automatically

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Added `android:localeConfig`

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Updated submodules

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

* Using `logger` instead of `println`

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>

Signed-off-by: Arnau Mora <arnyminer.z@gmail.com>
Co-authored-by: Ricki Hirner <hirner@bitfire.at>
Co-authored-by: Arnau Mora <arnyminer.z@gmail.com>