Internationalization (i18n) for Vitepress Documentation

[cgjgh]

Description

🌍Internationalization (i18n) for Dashboard 2.0 Vitepress Documentation

This PR introduces support for internationalization (i18n) in the online documentation for Dashboard 2.0, aligning its structure with the implementation method used by Vitepress for its own documentation.

Key Features:

• Reorganized documentation to follow Vitepress's i18n structure.
• Added support for the German language.

Notes:

• Future language additions can leverage this newly structured framework for simplified additions.

Related Issue(s)

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[joepavitt]

Just acknowledging that we will get this reviewed, but given it's size, I need to set some proper time aside to ensure there are no issues introduced.

[joepavitt]

Am working through this, apologies it's been so long, lots of clashing expected with #1684

[joepavitt]

So I've just pushed a commit which reduces the amount of duplication in the Vite config files. There is now a single config.json where the content is injected based on the selected language. There are then translation dictionaries in place for English & German, with the English setup as the backup should an entry not exist in the German file.

[joepavitt]

now to handle the merge conflicts with #1684

[joepavitt]

Unrelated test failure, so this is good to go. Thanks for the great work @cgjgh