When you currently access an overview in our Admin (e.g. Product overview), the content will always be shown in the system default language, no matter what your admin user setting is. I have attached a screenshot, where you can see, that the menus overall are all in english but the content is showing the german language instead, since it's the default system language.

This really annoying since it forces me to switch in every menu the content language back to english.

My suggestion would be to take the language settings of the admin user into account and always show the content also in that language.