translate login button

src/components/structures/LoginBox.js

@@ -69,7 +69,7 @@ module.exports = React.createClass({
             loginButton = (
                 <div className="mx_LoginBox_loginButton_wrapper">
                     <AccessibleButton className="mx_LoginBox_loginButton" element="button" onClick={this.onLoginClick}>
-                        Login
+                        { _t("Login") }
                     </AccessibleButton>
                 </div>
             );

src/i18n/strings/en_EN.json

@@ -51,6 +51,7 @@
   "Invite to this room": "Invite to this room",
   "Keywords": "Keywords",
   "Leave": "Leave",
+  "Login": "Login",
   "Low Priority": "Low Priority",
   "Members": "Members",
   "Mentions only": "Mentions only",