[API] Extend times API (#9200)

Extensively extend the times API.

close #8833; close #8513; close #8559

options/locale/locale_en-US.ini

@@ -960,6 +960,7 @@ issues.add_time = Manually Add Time
 issues.add_time_short = Add Time
 issues.add_time_cancel = Cancel
 issues.add_time_history = `added spent time %s`
+issues.del_time_history= `deleted spent time %s`
 issues.add_time_hours = Hours
 issues.add_time_minutes = Minutes
 issues.add_time_sum_to_small = No time was entered.