feat: export test run result (#220)

frontend/messages/en.json

@@ -188,7 +188,7 @@
     "close": "Close",
     "are_you_sure": "Are you sure you want to delete test cases?",
     "new_test_case": "New Test Case",
-    "download_csv": "Download CSV",
+    "export": "Export",
     "status": "Status",
     "no_cases_found": "No test cases found",
     "case_title": "Test Case Title",
@@ -254,6 +254,7 @@
     "updating": "Updating...",
     "update": "Update",
     "updated_test_run": "Updated test run",
+    "export": "Export",
     "progress": "Progress",
     "refresh": "Refresh",
     "id": "ID",