Change the strings and colors in the proposals answers states

[andreslucena]

For the Metadecidim feature proposals process, we need to change some of the words that use in the answers:

• "Accepted" becomes "Finished"
• "Evaluating" becomes "Accepted / In progress"

We also need to change the colors for these labels:

• The "warning" label changes to green
• The "success" label changes to purple

Screenshots

Testing

• Create proposals with different statuses and see that these changes are applied
• Change the languages to the ones supported on meta.decidim.org (Spanish and Catalan) and see that these strings are also changed

[andreslucena]

Maybe the CSS changes we need to do them with a Javascript hack (i.e. checking that the URL is inside this particular process?) as the CSS change could be applied to other labels. I'm not so sure actually.