1774: Move german translation mui components

[f1sh1918]

Short description

Move translation of mui-components and related components to translation file.
I decided to split this issue, since its really huge (see todo) and adding i18n in some form validation function may not be that trivial and needs some refactoring

Proposed changes

• add i18n for graphql error map
• add translations for most of the mui-components (some validation errors are missing)
• added readme to point out that the keys in "application" namespaces should not be edited, thats why i created a new namespace "applicationForms" for labels that could be changed

TODO

• finalize i18n for administration (Finalize translations for administration #1869)

Side effects

• may break labels for application form, activation, application applicant view, application verification view, card creation, self service portal (koblenz)

Testing

1. Create an application and create a card from the application for bavarian entitlementcard
2. Click on the mail links for application creation, application verification and card creation (card was created from application)
3. Create a koblenz pass within the self service portal
4. Check all the parts that were mentioned in side effects

Resolved issues

Fixes: #1774