Hi Rajan ,
Did you also configure in gateway system for spanish language
1) Run T code SICF
2) Navigate to /default_host/sap/bc/ui5_ui5/ui2/launchpage
3) The screen looks as in the screenshot below
Make sure you are in edit mode and select configuration .
System Login Settings contains the languages option. If enabled , will be appeared in launchpad (or) can be changed in language option in Create and change service.
Can you please check here and confirm back .
Regards
Virinchy