Custom Login Texts

[hifabienne]

As an administrator I want to be able to add my custom texts to the login UI for the languages I need.

The implementation is defined and dependent on #Custom Text API

Acceptance Criteria

• The login UI implements the Custom Text API to get the defined translations for the ui in the right context (organization, language)
• Given the requested language doesn't exist, the default language will be shown

[joshdcu]

Thank you for adding this issue! As a Zitadel admin, I would like to customize the following texts:

1. a disclosure/disclaimer text that should be prominently displayed in the login UI
2. a footer text
3. the header text

[joshdcu]

As a separate but related question, am I correct in assuming that all the login customization options from the old login UI will also be available in the new Typescript login UI?