Improved validation error text

[kennsippell]

Cannot find 'c_community_health_unit' matching Nakaale under Turkana South should be Cannot find 'community health unit' matching Nakaale under Turkana South

Not a valid phone number for country code KE sholud be Not a valid phone number for country Kenya

Error details should be shown on the edit page
Investigate as-to whether users find tooltip confusing and mitigate with UI hints as needed