Merge branch 'ee-js-i18n-c-d' into 'master'

i18n JS files starting with c or d - EE

See merge request gitlab-org/gitlab-ee!12393

locale/gitlab.pot

@@ -1540,6 +1540,14 @@ msgstr ""
 msgid "Attach a file by drag & drop or %{upload_link}"
 msgstr ""
 
+msgid "Attaching a file"
+msgid_plural "Attaching %d files"
+msgstr[0] ""
+msgstr[1] ""
+
+msgid "Attaching the file failed."
+msgstr ""
+
 msgid "Audit Events"
 msgstr ""