Fix grammar

Spotted by Robby at
https://translatewiki.net/wiki/Thread:Support/About_Mifos:X-validation.msg.staff.officeId.cannot.be.blank/lb
Localisation updates from https://translatewiki.net.
Localisation updates from https://translatewiki.net.
Merge pull request #845 from lingalamadhukar/bug_fixes

Label fix:Number of days a loan may be overdue before moving into arrears
Merge branch 'master' into develop
Format Number fix for empty strings