Marking copied from original strings enhancement

[vlad-timotei]

Following these steps

1. Select desired strings
2. Bulk actions > Copy from original
3. Apply

the expected result should be

• copying the original translation - works
• marking the strings that have been affected - works partially

---

(Note the background color being changed or not after bulk action.)

Marking string copied from original if:

• string is untranslated - works
  

• string has any other previous state - doesn't work.
  
  This is because the background color is already present. This can be fixed by adding !important here:
  

  GlotDict/css/style.css

  Lines 9 to 11 in bc2cf68

  	table.translations tr.preview.has-original-copy, #legend .has-original-copy {
  	background: #e5f5fa;
  	}

• string changes status in case automatic submission is enabled - doesn't work.
  
  This is supposed to be handled by this line of code, just that row is the current row id, and that changes after saving, so it doesn't affect the new row.
  

  GlotDict/js/glotdict-bulk.js

  Line 20 in f5e3390

  jQuery('#preview-' + row).addClass('has-original-copy');

  
  I don't have a fix for the last scenario, maybe something with Mutations Observer?