fix(server): permit to register new spellings for other languages than en

[mdevolde]

fix(server): permit to register new spellings for other languages than en

Why the pull request was made

To fix a bug that restrict the addition of words to english.
If you give new_spellings to LanguageTool with, for exemple, es as language, the new_spellings will be added in the english dict, and so, the custom words will not be taken into acount.

Summary of changes

• In language_tool_python.server.LanguageTool._get_valid_spelling_file_path, find the spelling file depending on the language of the current server.

Screenshots (if appropriate):

Not applicable.

How has this been tested?

By applying local tests, and by testing to add accepted words in some languages.

Resources

This commit on the fork of @vfigueroa-nur allowed me to detect this bug.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to documentation only)
• Refactor / code style update (non-breaking change that improves code structure or readability)
• Tests / CI improvement (adding or updating tests or CI configuration only)
• Other (please describe):

Checklist

• Followed the project's contributing guidelines.
• Updated any relevant tests.
• Updated any relevant documentation.
• Added comments to your code where necessary.
• Formatted your code, run the linters, checked types and tests.

[Copilot]

Pull request overview

This PR fixes LanguageTool(new_spellings=...) so custom spellings are registered in the LanguageTool resource directory matching the tool’s configured language (instead of being hard-coded to English), enabling non-English custom dictionaries.

Changes:

• Initialize self._language before registering new_spellings.
• Compute spelling.txt path using the instance language’s resource directory rather than /en/.

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