Set default language for TNTSearch

[Koc]

📝 Summary

This change improves morphology in search functionality by providing correct Stemmer for TNTSearch

🖼️ Screenshots

🏚️ Before	🏡 After

🚧 TODO

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

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[Koc]

@mejo- @juliushaertl can you review?

[juliusknorr]

Looks good to me with one comment regarding the default value

[Koc]

test failures looks unrelated

[mejo-]

Shouldn't this be some string that is less likely to be similar to no (for "Norwegian")?

[juliusknorr]

I asked earlier and this is just how tntsearch expects it https://github.com/teamtnt/tntsearch/blob/13096686f81856addcd2eabc5eb73a470be36fb4/src/Engines/EngineTrait.php#L167-L171

I think the constant is the best we can get for that ;)

[mejo-]

Ok, thanks for the pointer. Then the PR is good to go 😊 Thanks for the contribution @Koc!