c5e8ff66fb
Trello has [added 20 color variants](https://www.atlassian.com/blog/trello/20-new-trello-label-colors) that were not imported, added them. Also added a fallback to save labels even if the color is not mapped yet. Resolves https://community.vikunja.io/t/get-info-about-importation-trello/1968/16 Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/2178 Reviewed-by: konrad <k@knt.li> Co-authored-by: Hangya <ronkayj@gmail.com> Co-committed-by: Hangya <ronkayj@gmail.com>