Merge #1624 커버 이미지 선택 기능의 다국어 지원을 위한 PR by misol

* pr/1624:
  Revert "선택적 SSL 환경서 관리자 에디터 파일 첨부가 안되는 문제."
  커버 이미지 선택, 다국어 지원
  선택적 SSL 환경서 관리자 에디터 파일 첨부가 안되는 문제.

common/js/plugins/jquery.fileupload/js/main.js

@@ -22,8 +22,8 @@
 		actDeleteFile : '.xefu-act-delete',
 		actSetCover : '.xefu-act-set-cover',
 
-		tmplXeUploaderFileitem : '<li class="xefu-file xe-clearfix" data-file-srl="{{file_srl}}"><span class="xefu-file-name">{{source_filename}}</span><span class="xefu-file-info"><span>{{disp_file_size}}</span><span><input type="checkbox" data-file-srl="{{file_srl}}"> 선택</span></span></li>',
-		tmplXeUploaderFileitemImage: '<li class="xefu-file xefu-file-image {{#if cover_image}}xefu-is-cover-image{{/if}}" data-file-srl="{{file_srl}}"><strong class="xefu-file-name">{{source_filename}}</strong><span class="xefu-file-info"><span class="xefu-file-size">{{disp_file_size}}</span><span><img src="{{download_url}}" alt=""></span><span><input type="checkbox" data-file-srl="{{file_srl}}"></span><button class="xefu-act-set-cover" data-file-srl="{{file_srl}}" title="커버이미지로 선택"><i class="xi-check-circle"></i></button></span></li>'
+		tmplXeUploaderFileitem : '<li class="xefu-file xe-clearfix" data-file-srl="{{file_srl}}"><span class="xefu-file-name">{{source_filename}}</span><span class="xefu-file-info"><span>{{disp_file_size}}</span><span><input type="checkbox" data-file-srl="{{file_srl}}"> Select</span></span></li>',
+		tmplXeUploaderFileitemImage: '<li class="xefu-file xefu-file-image {{#if cover_image}}xefu-is-cover-image{{/if}}" data-file-srl="{{file_srl}}"><strong class="xefu-file-name">{{source_filename}}</strong><span class="xefu-file-info"><span class="xefu-file-size">{{disp_file_size}}</span><span><img src="{{download_url}}" alt=""></span><span><input type="checkbox" data-file-srl="{{file_srl}}"></span><button class="xefu-act-set-cover" data-file-srl="{{file_srl}}" title="Be a cover image"><i class="xi-check-circle"></i></button></span></li>'
 	};
 
 	var _elements = [