rm unused translation

apps/app/public/static/locales/en_US/translation.json

@@ -444,7 +444,6 @@
     "resolve_and_save" : "Resolve and save",
     "select_revision" : "Select {{revision}}",
     "requested_revision": "mine",
-    "origin_revision": "origin",
     "latest_revision": "theirs",
     "selected_editable_revision": "Selected Page Body (Editable)"
   },

apps/app/public/static/locales/ja_JP/translation.json

@@ -477,7 +477,6 @@
     "resolve_and_save" : "解消し保存する",
     "select_revision" : "{{revision}}にする",
     "requested_revision": "送信された本文",
-    "origin_revision": "送信する前の本文",
     "latest_revision": "最新の本文",
     "selected_editable_revision": "保存するページ本文(編集可能)"
   },

apps/app/public/static/locales/zh_CN/translation.json

@@ -433,7 +433,6 @@
     "resolve_and_save" : "解决冲突并保存",
     "select_revision" : "选择{{revision}}",
     "requested_revision": "发送的页面正文",
-    "origin_revision": "发送前的页面正文",
     "latest_revision": "最新页面正文",
     "selected_editable_revision": "选定的可编辑页面正文"
   },