Fix language build script.

This include the following changes:
- Remove qt5-default dependency from language script
- Regenerate the messages and translations

Additionally,
The PR also includes a minor refactoring.

src/tribler/gui/i18n/update_translations.sh

@@ -1,3 +1,3 @@
 #!/bin/bash
-#sudo apt install qtchooser qt5-default qttools5-dev-tools
+#sudo apt install qtchooser qttools5-dev-tools
 lrelease *.ts

src/tribler/gui/tests/test_utilities.py

@@ -4,6 +4,7 @@
 from urllib.parse import unquote_plus
 
 import pytest
+from pytest_asyncio import fixture
 
 from tribler.gui.utilities import TranslatedString, compose_magnetlink, create_api_key, dict_item_is_any_of, \
     duration_to_string, \
@@ -221,24 +222,20 @@ def test_missed_key_in_both_translated_and_original_strings(warning: Mock):
 
 
 @patch("tribler.gui.utilities.get_base_path")
-def test_i18n_file_path(mock_get_base_path, tmp_path):
+def test_i18n_file_path_and_languages_content(mock_get_base_path, tmp_path):
     mock_get_base_path.return_value = tmp_path
 
     filename = "languages.json"
     expected_path = Path(tmp_path) / I18N_DIR / filename
 
     assert get_i18n_file_path(filename) == expected_path
 
-
-@patch("tribler.gui.utilities.get_base_path")
-def test_get_languages_file_content(mock_get_base_path, tmp_path):
-    mock_get_base_path.return_value = tmp_path
-
     languages_json = {
         "unknown": "Unknown",
         "en": "English",
         "nl": "Dutch"
     }
+
     language_path = get_i18n_file_path(LANGUAGES_FILE)
     language_path.parents[0].mkdir(parents=True, exist_ok=True)
     language_path.write_text(json.dumps(languages_json))