colorize the error/warning messages during import

[MyPyDavid]

Rationale / Begründung

An editor wants to see if there occur any errors during import.

The warning messages at import "does not exist, but will be imported from this file." and "does not exist." have the same color. In case of "does not exist." it can lead to errors and could be marked in red.

Affected

Managers

Minimal functionality

• reformatting of warning messages for readability in https://github.com/rdmorganiser/rdmo/blob/master/rdmo/management/templates/management/import.html
• text font in red for "does not exist." warning, line break between messages

Nice-to-have functionality

What sort of related functionality would you like to see in addition?

References / Verweise

• Improve Import of changed catalogs #272
• more detailed update message during catalog import #468

[jochenklar]

Will be part of RDMO 2.2.0.