Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@holidays/countries/lebanon.py`:
- Line 46: supported_languages is indented with 3 spaces causing a syntax error;
align it with the surrounding class body by using 4-space indentation so the
tuple assignment (supported_languages = ("ar", "en_US", "fr")) is at the same
indentation level as other class attributes/methods (e.g., inside the Lebanon
class or equivalent) without changing the tuple contents.

In `@tests/countries/test_lebanon.py`:
- Around line 359-391: The test_l10n_fr expected strings in test_l10n_fr do not
match the updated French translations in LB.po; for dates with multiple holiday
names (e.g., 2025-04-18, 2025-04-21 and the other mismatched entries) update the
tuples in test_l10n_fr to use the exact French strings from
holidays/locale/fr/LC_MESSAGES/LB.po and ensure when multiple names share a date
they are alphabetically ordered within the string (separated by the same
delimiter used in LB.po); locate and edit the expected tuples in the
test_l10n_fr function to match LB.po exactly.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@tests/countries/test_lebanon.py`:
- Around line 327-328: Move the def test_l10n_default out of the nested scope so
it's a top-level test method in the test class (currently it's nested inside
test_2024); reduce its indentation to the class-level method indent (4 spaces)
and indent its body to the standard method body indent (8 spaces) so the method
signature is at the same indent as other test methods and unittest discovery
will find it; verify the method body lines are consistently indented and not
left-aligned with the def.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@CONTRIBUTORS`:
- Line 193: The CONTRIBUTORS file entry "Osama Alnajar" is out of alphabetical
order; remove the current line containing "Osama Alnajar" and insert it between
the lines for "Osayd Abdu" and "Oscar Romero" so the list remains sorted by
first name.