...
The default language for Portal is set during the installation, but it can be modified after login, by clicking on Language and selecting the desired language option (the language selection is persisted/saved per user and will also be applied for emails templates sent on user's behalf, for example emails sent during approval process).
Switch Tenant
If a user is member in multiple tenants security groups, he can switch tenants from the tenants list. The list of tenants is determined based on the security group role on each tenant for the logged in user. If the logged in user is member in a user type security group on first tenant and member in an admin type security group on second tenant, he can switch between first tenant and second tenant in Portal. When switching to second tenant, he will also have permission to switch to Administrator.
...