fixed folder delete popup issue
Merge branch 'release-6.2' of https://github.com/Gooru/Gooru-Web into release-6.2

Conflicts:
	src/main/java/org/ednovo/gooru/client/mvp/shelf/collection/folders/FolderItemTabView.java
Merge branch 'release-6.2' of https://github.com/Gooru/Gooru-Web into release-6.2
fixed ui issue for depth of knowledge
validate language objective with 415 according to story
Merge pull request #86 from nutan-gooru/release-6.2

fixed folder delete popup issue
fixed ui issue for depth of knowledge
validate language objective with 415 according to story