Add validator for sender field in CAP alerts

Now this validator checks for invalid characters [" ", ",", "&", "<"] and if the field is empty or not
Also added a validator to the email field in create shelter
Merge pull request #45 from svineet/svineet_staging

Add validator for sender field in CAP alerts
Merge pull request #50 from samsruti/master

bug fix for uploading image in SSF template
Scrollable dropdown for language menu in default and SSF not for GCI task