#5605 Time sheet -> improve error message for invalid time

[nilanga Nayanajith]

Version : OrangeHRM 2.6.9.8487

Summary : Time sheet -> improve error message for invalid time

Description :

"When I enter 5:61[null] in a timesheet, I am shown the message: ""Enter a Positive Duration in the Format of HH:mm[null] or 0.0h""

Improve this to: ""Enter a Valid Duration in the Format HH:mm[null] or 0.0h"""