diff --git a/controller/Controller.php b/controller/Controller.php
index 94ab0fb62..c500677db 100644
--- a/controller/Controller.php
+++ b/controller/Controller.php
@@ -48,6 +48,7 @@ public function setLanguageProperties($lang)
     {
         if (array_key_exists($lang, $this->languages)) {
             $locale = $this->languages[$lang]['locale'];
+            putenv("LANGUAGE=$locale");
             putenv("LC_ALL=$locale");
             setlocale(LC_ALL, $locale);
         } else {
diff --git a/tests/ConceptMappingPropertyValueTest.php b/tests/ConceptMappingPropertyValueTest.php
index 9a3a970fa..215210499 100644
--- a/tests/ConceptMappingPropertyValueTest.php
+++ b/tests/ConceptMappingPropertyValueTest.php
@@ -8,6 +8,7 @@ class ConceptMappingPropertyValueTest extends PHPUnit\Framework\TestCase
   private $props;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     bindtextdomain('skosmos', 'resource/translations');
diff --git a/tests/ConceptPropertyTest.php b/tests/ConceptPropertyTest.php
index 938091f70..f81f0bec2 100644
--- a/tests/ConceptPropertyTest.php
+++ b/tests/ConceptPropertyTest.php
@@ -5,6 +5,7 @@ class ConceptPropertyTest extends PHPUnit\Framework\TestCase
   private $model;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     bindtextdomain('skosmos', 'resource/translations');
diff --git a/tests/ConceptPropertyValueLiteralTest.php b/tests/ConceptPropertyValueLiteralTest.php
index c99d71d6d..fa8ca5d1b 100644
--- a/tests/ConceptPropertyValueLiteralTest.php
+++ b/tests/ConceptPropertyValueLiteralTest.php
@@ -7,6 +7,7 @@ class ConceptPropertyValueLiteralTest extends PHPUnit\Framework\TestCase
   private $vocab;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     bindtextdomain('skosmos', 'resource/translations');
diff --git a/tests/ConceptPropertyValueTest.php b/tests/ConceptPropertyValueTest.php
index 07dae4aee..3fb4601ca 100644
--- a/tests/ConceptPropertyValueTest.php
+++ b/tests/ConceptPropertyValueTest.php
@@ -7,6 +7,7 @@ class ConceptPropertyValueTest extends PHPUnit\Framework\TestCase
   private $vocab;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     bindtextdomain('skosmos', 'resource/translations');
diff --git a/tests/ConceptSearchParametersTest.php b/tests/ConceptSearchParametersTest.php
index 1a98215fd..f6c70694a 100644
--- a/tests/ConceptSearchParametersTest.php
+++ b/tests/ConceptSearchParametersTest.php
@@ -6,6 +6,7 @@ class ConceptSearchParametersTest extends PHPUnit\Framework\TestCase
     private $request;
 
     protected function setUp() {
+        putenv("LANGUAGE=en_GB.utf8");
         putenv("LC_ALL=en_GB.utf8");
         setlocale(LC_ALL, 'en_GB.utf8');
         $this->request = $this->getMockBuilder('Request')->disableOriginalConstructor()->getMock();
diff --git a/tests/ConceptTest.php b/tests/ConceptTest.php
index 25d35ca74..a2440b1ea 100644
--- a/tests/ConceptTest.php
+++ b/tests/ConceptTest.php
@@ -8,6 +8,7 @@ class ConceptTest extends PHPUnit\Framework\TestCase
   private $cbdGraph;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     bindtextdomain('skosmos', 'resource/translations');
diff --git a/tests/GenericSparqlTest.php b/tests/GenericSparqlTest.php
index 7367c8772..5604bbf70 100644
--- a/tests/GenericSparqlTest.php
+++ b/tests/GenericSparqlTest.php
@@ -9,6 +9,7 @@ class GenericSparqlTest extends PHPUnit\Framework\TestCase
   private $params;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     $this->model = new Model(new GlobalConfig('/../tests/testconfig.ttl'));
diff --git a/tests/JenaTextSparqlTest.php b/tests/JenaTextSparqlTest.php
index 371bfe425..9189fd809 100644
--- a/tests/JenaTextSparqlTest.php
+++ b/tests/JenaTextSparqlTest.php
@@ -9,6 +9,7 @@ class JenaTextSparqlTest extends PHPUnit\Framework\TestCase
   private $params;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     $this->model = new Model(new GlobalConfig('/../tests/jenatestconfig.ttl'));
diff --git a/tests/ModelTest.php b/tests/ModelTest.php
index 28b2b4ba3..402adea2a 100644
--- a/tests/ModelTest.php
+++ b/tests/ModelTest.php
@@ -6,6 +6,7 @@ class ModelTest extends PHPUnit\Framework\TestCase
   private $model;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     $this->model = new Model(new GlobalConfig('/../tests/testconfig.ttl'));
diff --git a/tests/RequestTest.php b/tests/RequestTest.php
index a8e02dbe3..9c3df3948 100644
--- a/tests/RequestTest.php
+++ b/tests/RequestTest.php
@@ -6,6 +6,7 @@ class RequestTest extends PHPUnit\Framework\TestCase
   private $request;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     bindtextdomain('skosmos', 'resource/translations');
diff --git a/tests/RestControllerTest.php b/tests/RestControllerTest.php
index f7d6f30b7..eb8793bfb 100644
--- a/tests/RestControllerTest.php
+++ b/tests/RestControllerTest.php
@@ -8,6 +8,7 @@
 class RestControllerTest extends \PHPUnit\Framework\TestCase
 {
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     bindtextdomain('skosmos', 'resource/translations');
@@ -60,4 +61,4 @@ public function testSearchJsonLdWithAdditionalFields() {
 
     $this->assertJsonStringEqualsJsonString('{"@context":{"skos":"http:\/\/www.w3.org\/2004\/02\/skos\/core#","isothes":"http:\/\/purl.org\/iso25964\/skos-thes#","onki":"http:\/\/schema.onki.fi\/onki#","uri":"@id","type":"@type","results":{"@id":"onki:results","@container":"@list"},"prefLabel":"skos:prefLabel","altLabel":"skos:altLabel","hiddenLabel":"skos:hiddenLabel","broader":"skos:broader","relatedMatch":"skos:relatedMatch"},"uri":"","results":[{"uri":"http:\/\/www.skosmos.skos\/test\/ta117","type":["skos:Concept","meta:TestClass"],"broader":[{"uri":"http:\/\/www.skosmos.skos\/test\/ta1"}],"relatedMatch":[{"uri":"http:\/\/www.skosmos.skos\/test\/ta115"}],"prefLabel":"3D Bass","lang":"en","vocab":"test"},{"uri":"http:\/\/www.skosmos.skos\/test\/ta116","type":["skos:Concept","meta:TestClass"],"broader":[{"uri":"http:\/\/www.skosmos.skos\/test\/ta1"}],"prefLabel":"Bass","lang":"en","vocab":"test"},{"uri":"http:\/\/www.skosmos.skos\/test\/ta122","type":["skos:Concept","meta:TestClass"],"broader":[{"uri":"http:\/\/www.skosmos.skos\/test\/ta116"}],"prefLabel":"Black sea bass","lang":"en","vocab":"test"}]}', $out);
   }
-}
\ No newline at end of file
+}
diff --git a/tests/VocabularyCategoryTest.php b/tests/VocabularyCategoryTest.php
index 0abdfc57f..10ac7cdb2 100644
--- a/tests/VocabularyCategoryTest.php
+++ b/tests/VocabularyCategoryTest.php
@@ -6,6 +6,7 @@ class VocabularyCategoryTest extends PHPUnit\Framework\TestCase
   private $mockres;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     $this->model = new Model(new GlobalConfig('/../tests/testconfig.ttl'));
diff --git a/tests/VocabularyConfigTest.php b/tests/VocabularyConfigTest.php
index 87199861e..45d20db01 100644
--- a/tests/VocabularyConfigTest.php
+++ b/tests/VocabularyConfigTest.php
@@ -10,6 +10,7 @@ class VocabularyConfigTest extends PHPUnit\Framework\TestCase
    * @throws Exception
    */
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     $this->model = new Model(new GlobalConfig('/../tests/testconfig.ttl'));
diff --git a/tests/VocabularyTest.php b/tests/VocabularyTest.php
index e54b67d00..7acb60d2e 100644
--- a/tests/VocabularyTest.php
+++ b/tests/VocabularyTest.php
@@ -8,6 +8,7 @@ class VocabularyTest extends \PHPUnit\Framework\TestCase
   private $model;
 
   protected function setUp() {
+    putenv("LANGUAGE=en_GB.utf8");
     putenv("LC_ALL=en_GB.utf8");
     setlocale(LC_ALL, 'en_GB.utf8');
     $this->model = new Model(new GlobalConfig('/../tests/testconfig.ttl'));