[Fix] Changed localeChoosingListener on kernel request

[Losams]

Type : [Fix] Problem with the welcome page on symfony 3.4.7

On symfony 3.4.7, the welcome page didn't throw an exception anymore (in debug mode). The localeChoosingListener has been put in kernel.request instead.

[grizzlylab]

Thank you @Losams for you work, I hope this can be merged soon.

[acasademont]

Thanks @Losams will try to take a look at the issue this weekend.

[XWB]

@acasademont Any updates? :)

[acasademont]

hey guys, so sorry for the late review. I'm trying to understand what's the underlying problem here, one test is also failing due to the patch. Could you please elaborate a bit more @Losams?

[Losams]

Yes IDK why the "testNoCookieOnError" crashed, to be honest I didn't check so far. All I can say is what I said on the commit : "On symfony 3.4.7, the welcome page didn't throw an exception anymore (in debug mode)." So the localeChoosingListener didn't fire anymore (only on debug env). For that I changed the dispatch to kernel.request