Reset translator injection before injecting settings

[M-arcus]

SendMailAction has already injected the mail's settings when this event is dispatched. Injecting again on top of that overwrites the translator's localeBeforeInject with the already injected locale, so SendMailAction's resetInjection() restores the mail's locale instead of the one the request started with - leaking it into everything that follows.

• closes FlowSubscriber::fixTranslator() leaks the mail locale into the rest of the request #91

[shyim]

but since which shopware version all range?

[M-arcus]

All Shopware 6 versions

[shyim]

@frosh-ci fix-cs

[frosh-automation]

Code style has been fixed and pushed to the branch.