message: Shorten message

conf/messages

@@ -297,15 +297,15 @@ issue.noAssignee = No assignee
 issue.noAuthor = No author
 issue.noDuedate = No due date
 issue.noMilestone = No milestone
-issue.option = Issue Option
+issue.option = Option
 issue.search = Search Issues
 issue.state = Status
 issue.state.all = All
 issue.state.assigned = Assigned
 issue.state.closed = Closed
 issue.state.enrolled = Status entered
 issue.state.open = Open
-issue.subtask.select = - If you want to make a Sub-Task, select the parent issue -
+issue.subtask.select = — Select parent issue —
 issue.template = Issue Template
 issue.template.edit = Edit
 issue.template.no.attachment.allow = Issue templates do not support attachments.

conf/messages.ko-KR

@@ -305,7 +305,7 @@ issue.state.assigned = 할당됨
 issue.state.closed = 닫힘
 issue.state.enrolled = 등록
 issue.state.open = 열림
-issue.subtask.select = — 자식 이슈(Sub-Task)로 지정하고 싶으면 부모 이슈를 선택하세요 —
+issue.subtask.select = — 부모 이슈 선택 —
 issue.template = 이슈 템플릿
 issue.template.edit = 편집
 issue.template.no.attachment.allow = 이슈 템플릿 작성시에는 첨부파일  기능을 지원하지 않습니다.