Bump pylint from 2.8.2 to 2.9.6 (#2934)

* Bump pylint from 2.8.2 to 2.9.6

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.8.2 to 2.9.6.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/main/ChangeLog)
- [Commits](https://github.com/PyCQA/pylint/compare/v2.8.2...v2.9.6)

---
updated-dependencies:
- dependency-name: pylint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* update preferences.py to comply with new pep8

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Noémi Ványi <kvch@users.noreply.github.com>
Co-authored-by: Noémi Ványi <sitbackandwait@gmail.com>

requirements-dev.txt

@@ -2,7 +2,7 @@ mock==4.0.3
 nose2[coverage_plugin]==0.10.0
 cov-core==1.15.0
 pycodestyle==2.7.0
-pylint==2.8.2
+pylint==2.9.6
 splinter==0.15.0
 transifex-client==0.14.3
 selenium==3.141.0

searx/preferences.py

@@ -178,7 +178,7 @@ class SearchLanguageSetting(EnumStringSetting):
         if data not in self.choices and data != self.value:  # pylint: disable=no-member
             # hack to give some backwards compatibility with old language cookies
             data = str(data).replace('_', '-')
-            lang = data.split('-')[0]
+            lang = data.split('-', maxsplit=1)[0]
             # pylint: disable=no-member
             if data in self.choices:
                 pass
@@ -502,7 +502,7 @@ class Preferences:
         """Save cookie in the HTTP reponse obect
         """
         for user_setting_name, user_setting in self.key_value_settings.items():
-            if self.key_value_settings[user_setting_name].locked:
+            if user_setting.locked:
                 continue
             user_setting.save(user_setting_name, resp)
         self.engines.save(resp)