added changes specified in issue#10176

[ShehanAT]

Added line: <%= raw translation('editor.rich.drag_image') %> to app/views/editor/rich.html.erb
and

rich:
  drag_image: "Drag an image here to upload."

to config/locales/en.yml

Fixes #10176 10176

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[noi5e]

Thank you @ShehanAT, unfortunately I was reserving this first-timer-only issue for another contributor.

I'm going to close this PR. If you want a first-timer issue please leave a comment at #10153.