MM-11384: Add system install date information to the client config (#9218)

* MM-11384: Add system install date information to the client config

* Fixing translation text

* Fixes from Peer Review

store/store.go

@@ -263,6 +263,7 @@ type UserStore interface {
 	GetProfilesNotInTeam(teamId string, offset int, limit int) StoreChannel
 	GetEtagForProfilesNotInTeam(teamId string) StoreChannel
 	ClearAllCustomRoleAssignments() StoreChannel
+	InferSystemInstallDate() StoreChannel
 }
 
 type SessionStore interface {