Fix deprecated flask-babel's localselector decorator
Since Flask-Babel 3.0.0 Babel.locale_selector no longer exists. It must be provided when the Babel() object is created or when init_app() is called.
Fixes: #405 (closed)
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Since Flask-Babel 3.0.0 Babel.locale_selector no longer exists. It must be provided when the Babel() object is created or when init_app() is called.
Fixes: #405 (closed)