Expanded the build script to build customizable multiple languages and models firmwares

[GeminiServer]

• Please check if the PR fulfills these requirements

• The changes have been tested locally
• There are no breaking changes

• What kind of change does this PR introduce?

Bug fix: Command line build customizable multiple firmwares with user defined languages and models was not possible.
This will expanded the build script to build customizable multiple languages and models firmwares.

• What is the current behavior?

Same as before with the additional possibility to build customizable selectable languages and models.

• What is the new behavior (if this is a feature change)?
  This was working:

• build.sh (Build all models and all languages)
• build.sh -l EN -m TS100 (Build one language and model)

This was not working: (Which is fixed with now.)

• build.sh -l EN -m "TS100 MHP30" (Build one language and multi models)
• build.sh -l "DE EN" -m "TS100 MHP30" (Build multi languages and models)