Modify messages in e-mail node to refer to language files (#343)

thanks @kazuhitoyokoi

social/email/61-email.html

@@ -38,7 +38,7 @@
         <input type="text" id="node-input-port" placeholder="465" style="width:100px">
         <label style="width:40px"> </label>
         <input type="checkbox" id="node-input-secure" style="display:inline-block; width:20px; vertical-align:baseline;">
-        Use secure connection.
+        <span data-i18n="email.label.useSecureConnection"></span>
     </div>
     <div class="form-row">
         <label for="node-input-userid"><i class="fa fa-user"></i> <span data-i18n="email.label.userid"></span></label>
@@ -150,9 +150,9 @@
     <div class="form-row node-input-disposition">
             <label for="node-input-disposition"><i class="fa fa-trash"></i> <span data-i18n="email.label.disposition"></span></label>
         <select type="text" id="node-input-disposition">
-            <option value="None" selected="selected">None</option>
-            <option value="Read">Mark Read</option>
-            <option value="Delete">Delete</option>
+            <option value="None" selected="selected" data-i18n="email.label.none"></option>
+            <option value="Read" data-i18n="email.label.read"></option>
+            <option value="Delete" data-i18n="email.label.delete"></option>
         </select>
     </div>
     <br/>

social/email/locales/en-US/61-email.json

@@ -4,6 +4,7 @@
             "to": "To",
             "server": "Server",
             "port": "Port",
+            "useSecureConnection": "Use secure connection.",
             "userid": "Userid",
             "password": "Password",
             "repeat": "Refresh",
@@ -11,7 +12,10 @@
             "folder": "Folder",
             "protocol": "Protocol",
             "useSSL": "Use SSL?",
-            "disposition": "Disposition"
+            "disposition": "Disposition",
+            "none": "None",
+            "read": "Mark Read",
+            "delete": "Delete"
         },
         "default-message": "__description__\n\nFile from Node-RED is attached: __filename__",
         "tip": {

social/email/locales/ja/61-email.json

@@ -4,6 +4,7 @@
             "to": "宛先",
             "server": "サーバ",
             "port": "ポート",
+            "useSecureConnection": "安全な接続を使用",
             "userid": "ユーザID",
             "password": "パスワード",
             "repeat": "更新",
@@ -11,7 +12,10 @@
             "folder": "フォルダ",
             "protocol": "プロトコル",
             "useSSL": "SSLを使用",
-            "disposition": "受信後の処理"
+            "disposition": "受信後の処理",
+            "none": "なし",
+            "read": "既読",
+            "delete": "削除"
         },
         "default-message": "__description__\n\nNode-REDからファイルが添付されました: __filename__",
         "tip": {