Bump flask-babel from 2.0.0 to 3.0.0

Bumps [flask-babel](https://github.com/python-babel/flask-babel) from 2.0.0 to 3.0.0.
- [Release notes](https://github.com/python-babel/flask-babel/releases)
- [Changelog](https://github.com/python-babel/flask-babel/blob/master/CHANGELOG)
- [Commits](https://github.com/python-babel/flask-babel/compare/v2.0.0...v3.0.0)

---
updated-dependencies:
- dependency-name: flask-babel
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

3 files changed, 5 insertions, 5 deletions

diff --git a/requirements.txt b/requirements.txt
index 2de33f4ba..947a88433 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 certifi==2022.12.7
 babel==2.11.0
-flask-babel==2.0.0
+flask-babel==3.0.0
 flask==2.2.2
 jinja2==3.1.2
 lxml==4.9.2
diff --git a/searx/locales.py b/searx/locales.py
index 8547e7fa7..9e06bf39d 100644
--- a/searx/locales.py
+++ b/searx/locales.py
@@ -86,7 +86,7 @@ def get_translations():
         use_translation = flask.request.form.get('use-translation')
         if use_translation in ADDITIONAL_TRANSLATIONS:
             babel_ext = flask_babel.current_app.extensions['babel']
-            return Translations.load(next(babel_ext.translation_directories), use_translation)
+            return Translations.load(babel_ext.translation_directories[0], use_translation)
     return _flask_babel_get_translations()
 
 
diff --git a/searx/webapp.py b/searx/webapp.py
index d4206ca16..d9ca3941c 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -160,8 +160,6 @@ app.jinja_env.add_extension('jinja2.ext.loopcontrols')  # pylint: disable=no-mem
 app.jinja_env.filters['group_engines_in_tab'] = group_engines_in_tab  # pylint: disable=no-member
 app.secret_key = settings['server']['secret_key']
 
-babel = Babel(app)
-
 timeout_text = gettext('timeout')
 parsing_error_text = gettext('parsing error')
 http_protocol_error_text = gettext('HTTP protocol error')
@@ -211,13 +209,15 @@ class ExtendedRequest(flask.Request):
 request = typing.cast(ExtendedRequest, flask.request)
 
 
-@babel.localeselector
 def get_locale():
     locale = localeselector()
     logger.debug("%s uses locale `%s`", urllib.parse.quote(request.url), locale)
     return locale
 
 
+babel = Babel(app, locale_selector=get_locale)
+
+
 def _get_browser_language(req, lang_list):
     for lang in req.headers.get("Accept-Language", "en").split(","):
         if ';' in lang: