Fix English translation grammar and consistency. (#3921)

options/locale/locale_en-US.ini

@@ -739,15 +739,15 @@ issues.cancel_tracking = Cancel
 issues.cancel_tracking_history = `cancelled time tracking %s`
 issues.time_spent_total = Total Time Spent
 issues.time_spent_from_all_authors = `Total Time Spent: %s`
-issues.due_date = Due date
-issues.invalid_due_date_format = "Due date format is invalid, must be 'yyyy-mm-dd'."
-issues.error_modifying_due_date = "An error occured while modifying the due date."
-issues.error_removing_due_date = "An error occured while remvoing the due date."
+issues.due_date = Due Date
+issues.invalid_due_date_format = "Due date format must be 'yyyy-mm-dd'."
+issues.error_modifying_due_date = "Failed to modify the due date."
+issues.error_removing_due_date = "Failed to remove the due date."
 issues.due_date_form = "yyyy-mm-dd"
 issues.due_date_form_add = "Add due date"
 issues.due_date_form_update = "Update due date"
 issues.due_date_form_remove = "Remove due date"
-issues.due_date_not_writer = "You need to have at least write access to this repository in order to update the due date for this issue."
+issues.due_date_not_writer = "You need repository write access to update an issue's due date."
 issues.due_date_not_set = "No due date set."
 issues.due_date_added = "added the due date %s %s"
 issues.due_date_modified = "modified the due date to %s from %s %s"
@@ -1352,8 +1352,8 @@ auths.attribute_name = First Name Attribute
 auths.attribute_surname = Surname Attribute
 auths.attribute_mail = Email Attribute
 auths.attributes_in_bind = Fetch Attributes in Bind DN Context
-auths.use_paged_search = Use paged search
-auths.search_page_size = Page size
+auths.use_paged_search = Use Paged Search
+auths.search_page_size = Page Size
 auths.filter = User Filter
 auths.admin_filter = Admin Filter
 auths.ms_ad_sa = MS AD Search Attributes