Hi ,
Hope you are doing good.
The language that the portal is displayed depends on the following heirarchy, with the languages at the top of the list taking precedence over those at the bottom:
1. Component (iview) language (defined in the portalapp.xml)
2. Portal Mandatory language (defined in the prtDefault.properties)
3. User language (defined in the user#s profile).
4. Request language (defined by the browser).
5. Portal Default language (defined in the prtDefault.properties)
6. System Default language (default locale defined by the OS).
So for example, if you have your portal user language (as in point 3) set to German, but the language of the iView that is the logon page(as in point 1) set to English, that logon page will be displayed in English.
For more information check:
#947081 - Locales, languages, date and time formats in Web Dynpro
and
https://help.sap.com/saphelp_nw73/helpdata/en/49/dba4625dba551de10000000a42189c/content.htm
Thank you!
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Kind Regards,
Hemanth
SAP AGS