Autogenerate substation fails

[Stef3st]

The autogenerate substation fails in some cases. The cause of this is that a String function gets called on possibly empty array elements. The autogenerate substation also lacks a few newly discovered features. These can be fixed with this ticket.

Acceptance criteria:

• Fix the bug with empty array elements in the substation names array.
• Add logging, so that the user gets some feedback when triggering the plugin. Be sure to use the translation files and not just static text.
• It turns out the substation seperator is different then previously expected. The new rules that need to be implemented are:
  • The substation name will always reserve 5 characters
  • If the name is shorter than 5 characters then the '_' symbol gets appended until the 5 character length is met.
• Alter documentation in the source code where needed to keep the explaination up-to-date.