Fix translated medias in settings

[smeeckaert]

Hi,

It looks like using a medias field with the configuration key twill.media_library.translated_form_fields = true in the settings doesn't work at all.

I've fixed two issues to allow medias in settings to be localized.

1. There was a bug in the MediaField vue component, when used in a setting page the field name image[en] would be translated to medias[image[en]][0] which doesn't work. My fix changes it to a working medias[image][en][0].

I don't know if there is any side effects to this changes but I think not. I've tried every instance of this component on my relatively small website and everything works as intented.

2. I've updated the SettingRepository to work with localized medias if the twill.media_library.translated_form_fields configuration key is set to true.

These changes would probably break the translated medias on websites with the twill.media_library.translated_form_fields activated but like I said it doesn't work at all at the moment so it shouldn't be much of an issue.

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[marinaglancy]

Hi! I just commented on #87 -
in MediaField.vue you should use this.mediaKey instead of this.name, otherwise it does not work with multiple medias