reorganization of tests (1 route per file), add some basic tests

tests/test_api/test_api_get_languages.py

@@ -0,0 +1,16 @@
+import json
+
+
+def test_api_get_languages(client):
+    response = client.get("/languages")
+    response_json = json.loads(response.data)
+
+    assert "code" in response_json[0] and "name" in response_json[0]
+    assert len(response_json) >= 1
+    assert response.status_code == 200
+
+
+def test_api_get_languages_must_fail_bad_request_type(client):
+    response = client.post("/spec")
+
+    assert response.status_code == 405