Added the possibility to assign projects to a team/portfolio, backported to branch 4.3.x

[malice00]

This PR implements issue #162, by adding a new field in the UI that takes the name of a team to which a project is to be assigned when uploading BOM data.

• Changes in UI added

• Help texts added

• Translation in German added (not a native speaker, so some small grammar issues might exist)

• Documentation added

• [X] Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!

• [X] Ensure that the pull request title represents the desired changelog entry

• [X] Please describe what you did

• [X] Link to relevant issues in GitHub or Jira

• [x] Link to relevant pull requests, esp. upstream and downstream changes

• [X] Ensure you have provided tests - that demonstrates feature works or fixes the issue

Effectively this is the same as #163, only on the 4.3.x branch, seeing the master had some issues when I deployed a build on my jenkins!

[sephiroth-j]

1. This is a new feature and version 4.3.x receives only important bug fixes.
2. This feature is rejected as mentioned in #162