Fix text on "mobile" login button.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3307 44740490-163a-0410-bde0-09ae8108e29a

templates/login.php

@@ -54,7 +54,7 @@
 			<td><input id="password" type="password" tabindex="2" name="password" /></td>
 		</tr>
 	<tr><td></td><td>
-	<input type="submit" tabindex="5" id="mobilesubmit" value="<?php echo $this->t('{login_button}'); ?>" />
+	<input type="submit" tabindex="5" id="mobilesubmit" value="<?php echo $this->t('login_button'); ?>" />
 	</td></tr>
 	</table>