Add comment on large number of objects

[jburel]

• Select a large number of objects e.g. 500 Possible with Query string ids #225
• Go to the Comments harmonica
• Enter text and click Add comment
• Comment does not get saved

[pwalczysko]

For me, the comment does get saved after a while. This might be dependent on internet speed, but there is a definite lag with no explanation even on the institutional internet I am on now.

[will-moore]

Adding a comment to 500 images is working for me on merge-ci, takes about 9 seconds (see screenshot):
I'll open a PR to add a spinner, so the user knows something is happening...