feat: Feature excel import (#4742619125)

[Marinolino]

Before submitting your PR, ensure the following points:

• [x] Your PR goes to the appropriate branch
• [x] Add descriptive title (not just the branch name)
• [x] Add a short description below
• [x] Your code follows the code conventions in the Wiki

What does your PR change?

• Article suggestions can be uploaded as .xlsx
• Entering an article number will provide suggestions, which will autocomplete available fields
• Total sum of all costs
• Minor bugfixes