Do not load translations from a relative path

When the application is installed outside of the
document root, loading translations will not work.

tests/units/Core/TranslatorTest.php

@@ -0,0 +1,45 @@
+<?php
+
+require_once __DIR__.'/../Base.php';
+
+use Kanboard\Core\Translator;
+
+class TranslatorTest extends Base
+{
+    public function setUp()
+    {
+        parent::setUp();
+        Translator::unload();
+    }
+
+    public function testLoading()
+    {
+        $translator = new Translator();
+        $this->assertSame('Yes', $translator->translate('Yes'));
+
+        Translator::load('fr_FR');
+        $this->assertSame('Oui', $translator->translate('Yes'));
+
+        Translator::unload();
+        $this->assertSame('Yes', $translator->translate('Yes'));
+
+        Translator::load('de_DE', Translator::getDefaultFolder());
+        $this->assertSame('Ja', $translator->translate('Yes'));
+    }
+
+    public function testNumberFormatting()
+    {
+        $translator = new Translator();
+        $this->assertSame('1,024.42', $translator->number(1024.42));
+
+        Translator::load('fr_FR');
+        $this->assertSame('1 024,42', $translator->number(1024.42));
+    }
+
+    public function testTranslateEscaping()
+    {
+        $translator = new Translator();
+        $this->assertSame('&lt;b&gt;', $translator->translate('<b>'));
+        $this->assertSame('<b>', $translator->translateNoEscaping('<b>'));
+    }
+}