Allow "Finishing..." button on setup page to be translated.

Fixes #5130.

core/js/setup.js

@@ -54,7 +54,7 @@ $(document).ready(function() {
 		var post = $(this).serializeArray();
 
 		// Disable inputs
-		$(':submit', this).attr('disabled','disabled').val('Finishing …');
+		$(':submit', this).attr('disabled','disabled').val($(':submit', this).data('finishing'));
 		$('input', this).addClass('ui-state-disabled').attr('disabled','disabled');
 		$('#selectDbType').buttonset('disable');
 

core/templates/installation.php

@@ -172,5 +172,5 @@
 		<?php endif; ?>
 	</fieldset>
 
-	<div class="buttons"><input type="submit" class="primary" value="<?php p($l->t( 'Finish setup' )); ?>" /></div>
+	<div class="buttons"><input type="submit" class="primary" value="<?php p($l->t( 'Finish setup' )); ?>" data-finishing="<?php p($l->t( 'Finishing …' )); ?>" /></div>
 </form>