Added translation unittests

unittests/unittests_translation/translation/de.json

@@ -0,0 +1,7 @@
+{
+  "main": {
+    "text": {
+      "hello_world": "Hallo Welt"
+    }
+  }
+}

unittests/unittests_translation/translation/en.json

@@ -0,0 +1,7 @@
+{
+  "main": {
+    "text": {
+      "hello_world": "Hello World"
+    }
+  }
+}