fix naming of translation files · spatie/holidays@60cc514

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Albania)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Azerbaijan)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Bahrain)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Bangladesh)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Belarus)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Belgium)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/BosniaAndHerzegovina)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Ecuador)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Egypt)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

Run PHPStan: src/Concerns/Translatable.php (in context of class Spatie/Holidays/Countries/Finland)#L40

Parameter #1 $string of function strtolower expects string, string|null given.

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