Function of extension-contributed buttons is not clear

Created by: mrnugget

I just noticed that on Sourcegraph.com the buttons above a file also show up as text:

See here: https://sourcegraph.com/github.com/sourcegraph/sourcegraph/-/blob/enterprise/cmd/frontend/internal/dotcom/productsubscription/subscriptions_db.go#L12:41

I don't think that's the intended behavior, since it doesn't show up on sourcegraph.sgdev.org: https://sourcegraph.sgdev.org/sourcegraph/enterprise@093a16521df58e6c49cf70e6a4832137e740265a/-/blob/enterprise/cmd/frontend/internal/dotcom/productsubscription/subscriptions_db.go

(@lguychard: I don't know who to assign this to, feel free to re-assign!)