Add unit test for locales to ensure number of %d and %s placeholders are correct.

tests/units/LocaleTest.php

@@ -0,0 +1,29 @@
+<?php
+
+require_once __DIR__.'/Base.php';
+
+class LocaleTest extends Base
+{
+    public function testLocales()
+    {
+        foreach(glob('app/Locale/*') as $l)
+        {
+            $locale = require($l . '/translations.php');
+            foreach($locale as $k => $v)
+            {
+                if(strpos($k,'%B %e, %Y') !== false)
+                    continue;
+                if(strpos($k,'%b %e, %Y') !== false)
+                    continue;
+                foreach(array('%s', '%d') as $placeholder)
+                {
+                    $this->assertEquals(
+                        substr_count($k, '%s'),
+                        substr_count($v, '%s'),
+                        'Incorrect number of ' . $placeholder . ' in ' . basename($l) .' translation of: ' . $k
+                    );
+                }
+            }
+        }
+    }
+}