Display annotation property names for definition/descripion/comment

[dosumis]

Currently it is not clear when text at the top of the page comes from different fields. Content should instead be prefixed with the name of the annotation property used

e.g. this has seperate entries from
IAO:definition
dcterms:description
rfds:comment:

[jamesamcl]

I suppose there is actually no need to use the merged description property in the frontend anymore as the original properties should still be preserved in the v2 api.

(but the merged description is still very useful in the API)