MDL-37759 Question: Drag Drop Images group add more link
Merge pull request #16 from colchambers/MDL-37759

MDL-37759 Question: Drag Drop Images group add more link
MDL-37463 Question: Drag drop image form lang capitalisation
Merge pull request #17 from colchambers/MDL-37463

MDL-37463 Question: Drag drop image form lang capitalisation
Clean up comments in unit tests.
Move lang strings to AMOS.
Fix codechecker and jshint issues.
Bump version number.