feat: convert localizations from language-country to langauge

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Bencher

Report	Fri, April 12, 2024 at 19:30:47 UTC
Project	theseus-rs/rsql
Branch	convert-to-languages
Testbed	localhost

Benchmark	Latency	Latency Results nanoseconds (ns)
duckdb	➖ (view plot)	3951000.000
postgres-embedded	➖ (view plot)	816260000.000
postgresql-embedded	➖ (view plot)	823110000.000
rusqlite	➖ (view plot)	268340.000
sqlite	➖ (view plot)	502530.000

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.87%. Comparing base (cd7aaa9) to head (004cdfe).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #119 +/- ## ======================================= Coverage 95.87% 95.87% ======================================= Files 79 79 Lines 9084 9084 ======================================= Hits 8709 8709 Misses 375 375 ```

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