update pdf viewer and remove CORS check

res/static/misc/pdf-viewer/web/locale/ar/viewer.properties

@@ -226,6 +226,10 @@ invalid_file_error=ملف PDF تالف أو غير صحيح.
 missing_file_error=ملف PDF غير موجود.
 unexpected_response_error=استجابة خادوم غير متوقعة.
 
+# LOCALIZATION NOTE (annotation_date_string): "{{date}}" and "{{time}}" will be
+# replaced by the modification date, and time, of the annotation.
+annotation_date_string={{date}}، {{time}}
+
 # LOCALIZATION NOTE (text_annotation_type.alt): This is used as a tooltip.
 # "{{type}}" will be replaced with an annotation type from a list defined in
 # the PDF spec (32000-1:2008 Table 169 – Annotation types).