rename 'Close Account' back to 'Deactivate Account'.

the word close on a red button makes you feel like you're going to close the
settings dialog, not terminate your account...

src/components/views/settings/tabs/GeneralUserSettingsTab.js

@@ -162,7 +162,7 @@ export default class GeneralUserSettingsTab extends React.Component {
                     {_t("Deactivating your account is a permanent action - be careful!")}
                 </span>
                 <AccessibleButton onClick={this._onDeactivateClicked} kind="danger">
-                    {_t("Close Account")}
+                    {_t("Deactivate Account")}
                 </AccessibleButton>
             </div>
         );