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Most engines response best results if a region is selected, most often a
language is also in the properties of a engine and sometimes the language
argument is just the language of the UI. Most often choosing a language has a
minor effect on the result list.
To summarize:
Some engines have language codes (e.g. `ca`) in their properties, some have
region codes (e.g. `ca-ES`), some have regions and languages in their properties
and other engine do not have any language or region support.
In the past we generalized *language* over all kind of engines without taking
into mind that most engines gave best result when there is a region selected.
This *language-centric* view in SearXNG is misleading when we need
region-codes to parameterize engine request!
This patch replaces the *language-centric* view by a "language / region" view.
Conclusions:
With regions we can't say any longer that a engine supports *this or that*
language, by example: when the user selects 'zh' and a engine supports only
region codes like 'zh-TW' or 'zh-CN' we do not what results the user expects /
similar with 'en' or 'fr when the engine needs a region tag.
- Since it is unclear what the user expects by his language selection, we can't
assert a property that says: "supports_selected_language"
The feature is replaced in the UI by the wider sense of "language_support",
what stands for:
The engine has some kind of language support, either
by a region tag or by a language tag.
- A list of "supported_languages" does not make sense when there are regions
responsible for the result of an engine.
The "supported_languages" has been removed from the /config URL
- The `has_language` test in the `searx/search/checker/impl.py` has been removed
since it does not cover engines with region support.
If there is a need for such a test we can implement new tests after all
engines with language (region) support has been moved to the *supported
properites* scheme (see searxng_extra/update/update_languages.py)
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
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