Adding labels to papers

[nicoSix]

A great addition to Ardent could be labels (like Github) to indicate information on papers and filter using them.
For example, I could add a label "Need refinement" on a paper to indicate that its architectures need to be refined.

It requires to check if labels could be also applied somewhere else (architectures? components?) and possible collisions with paper status? (status must be more strict than label)