Added ability to remove unassigned user role.
Added the validation when import translations
Added validation to the translations on the UI
add SMS Billables report
add table headers
add rows to SMS Billables report
Refactored code.
define new filters
Merge pull request #3290 from lwyszomi/74516-case

Parameters validation for the translations
add filters to SMS Billables report
fix TypeError
improve presentation of row data
catch protected errors when deleting line items (due to credit lines)
move SMS Billables report to the smsbillables app
Merge pull request #3331 from dimagi/sms_billables_report

Sms billables report
add SMS Gateway Fee Criteria report
add table headers
add rows
Merge pull request #3332 from dimagi/fix-invoice-trigger

catch protected errors when deleting line items (due to credit lines)
move SMS Gateway Fee Criteria interface to smsbillables