UI: CURD labels

- fix update lable break connection with repository

conf/locale/locale_en-US.ini

@@ -143,6 +143,11 @@ invalid_code = Sorry, your confirmation code has expired or not valid.
 reset_password_helper = Click here to reset your password
 password_too_short = Password length cannot be less then 6.
 
+[modal]
+yes = Yes
+no = No
+modify = Modify
+
 [form]
 UserName = Username
 RepoName = Repository name
@@ -372,14 +377,18 @@ issues.filter_type.assigned_to_you = Assigned to you
 issues.filter_type.created_by_you = Created by you
 issues.filter_type.mentioning_you = Mentioning you
 issues.opened_by = opened %s by <a href="/%[2]s">%[2]s</a>
+issues.previous = Previous Page
+issues.next = Next Page
 issues.label_title = Label name
 issues.label_color = Label color
 issues.label_count = %d labels
 issues.label_open_issues = %d open issues
 issues.label_edit = Edit
 issues.label_delete = Delete
-issues.previous = Previous Page
-issues.next = Next Page
+issues.label_modify = Label Modification
+issues.label_deletion = Label Deletion
+issues.label_deletion_desc = Delete label will remove it's information in all related issues. Do you want to continue?
+issues.label_deletion_success = Label has been deleted successfully!
 
 settings = Settings
 settings.options = Options