Added new text in message properties file.
Added Message when no students were joined.
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch

* upstream/dev-branch:
  Share Url issue resolved
  added background for popup
  Removed itemseq taking from API and rectified issue with re-order.
  score hedging view issue for Itemsequence value
  Fixed reorder issue
  Due date field validation has been implemented.
  "unit name junking on hover issue fixed"
  Modified and added new messages in MessageProperty file
  reseting unit assignment view functionality issue has been fixed.
  classsetup load issues resolved
  More Units Item sequence issue resolved

Conflicts:
	src/main/java/org/ednovo/gooru/shared/i18n/MessageProperties.java
	src/main/java/org/ednovo/gooru/shared/i18n/MessageProperties.properties
Added general text on assignment
Merge branch 'dev-branch' of https://github.com/Gooru/Gooru-Web into dev-branch
Merge pull request #1757 from anilgooru/dev-branch

Added new text in message properties file.
Merge pull request #1755 from shivalinga/dev-branch

validation has been implemented for minimum score and suggested time.
resolved conflicts
Assignment pagination issue rectified at student view.
Merge branch 'dev-branch' of https://github.com/Gooru/Gooru-Web into dev-branch
Infinite load issue resolved in classsetup
Merge pull request #1758 from nutan-gooru/dev-branch

Added general text for assignment
Merge pull request #1759 from VinRudramurthy/dev-branch

Assignment pagination issue rectified at student view.
Merge pull request #1760 from ssushma/dev-branch

Infinite load issue resolved in classsetup
Media script changes implemented
Merge pull request #1761 from ssushma/dev-branch

Media script changes implemented
"study popup implemented for student view hover on assignments"
Merge remote-tracking branch 'upstream/dev-branch' into dev-branch
Merge pull request #1762 from sravanthi1/dev-branch

"study popup implemented for student view hover on assignments"
"study popup top position adjusted"