Component Names are still present in admin interface

[GlennRicaud]

Component names do not seem to be mapped back to JS anymore but they seem to still be returned in the Admin rest interface or when generating a fragment
-> Investigate what are the users of component names

The main problem is how this field is populated.
In the case of image or fragment components, a call to "contentService.getById" is done for each of these components, just to get the display name of the related content and set it as a name on the component.
-> Fix at least this behaviour. Investigate the impact of a change of value for component names

IMO, if there needs to be some additional retrievals just for admin, they should be done at admin level and definitely not in the node->content translation