Fixes #7599: TypeError when the translated string does not have the correct number of positional parameters

src/tribler/gui/i18n/ru_RU.ts

@@ -328,7 +328,7 @@
     <message>
         <location filename="../widgets/downloadspage.py" line="463"/>
         <source>An error occurred when exporting the torrent file: %s</source>
-        <translation>Ошибка при экспорте торрент-файла:</translation>
+        <translation>Ошибка при экспорте торрент-файла: %s</translation>
     </message>
     <message>
         <location filename="../widgets/downloadspage.py" line="469"/>

src/tribler/gui/tests/test_utilities.py

@@ -192,7 +192,8 @@ def test_missed_key_in_translated_string(warning: Mock):
     # In this test, we pass the correct param 'key1' presented in the original string but missed in the translation.
     # The KeyError is intercepted, the original string is used instead of the translation, and the error is logged
     # as a warning.
-    assert s % {'key1': '123'} == 'original 123'
+    result = s % {'key1': '123'}
+    assert result == 'original 123'
 
     warning.assert_called_once_with('KeyError: No value provided for \'key2\' in translation "translated %(key2)s", '
                                     'original string: "original %(key1)s"')
@@ -215,3 +216,34 @@ def test_missed_key_in_both_translated_and_original_strings(warning: Mock):
 
     warning.assert_called_once_with('KeyError: No value provided for \'key2\' in translation "translated %(key2)s", '
                                     'original string: "original %(key1)s"')
+
+
+@patch('tribler.gui.utilities.logger.warning')
+def test_wrong_parameters_in_translated_string(warning: Mock):
+    original_string = 'original: %s'
+    translated_string = 'translated'
+    s = TranslatedString(translated_string, original_string)
+
+    # In this test, we pass the correct positional param value '123' for a positional parameter that presents in the
+    # original string but is missed in the translation. The TypeError is intercepted; the original string is used
+    # instead of the translation, and the error is logged as a warning.
+    result = s % ('123',)
+    assert result == 'original: 123'
+
+    warning.assert_called_once_with('TypeError: Wrong number of parameters in translation "translated", '
+                                    'original string: "original: %s"')
+
+
+@patch('tribler.gui.utilities.logger.warning')
+def test_wrong_parameters_in_original_string(warning: Mock):
+    original_string = 'original'
+    translated_string = 'translated'
+    s = TranslatedString(translated_string, original_string)
+
+    # If neither translated nor original string have the matched number of positional parameters,
+    # then the TypeError exception is propagated.
+    with pytest.raises(TypeError, match='^not all arguments converted during string formatting$'):
+        _ = s % ('123',)
+
+    warning.assert_called_once_with('TypeError: Wrong number of parameters in translation "translated", '
+                                    'original string: "original"')

src/tribler/gui/utilities.py

@@ -55,6 +55,10 @@ def __mod__(self, other):
             msg = f'No value provided for {e} in translation "{self}", original string: "{self.original_string}"'
             logger.warning(f'{type(e).__name__}: {msg}')
             return self.original_string % other
+        except TypeError as e:
+            msg = f'Wrong number of parameters in translation "{self}", original string: "{self.original_string}"'
+            logger.warning(f'{type(e).__name__}: {msg}')
+            return self.original_string % other
 
 
 def tr(key):