Amar,
You just need to add i18n file for Hindi/Gujarati. I do not see any issue here.
Identifying the Language Code / Locale - User Interface Add-On for SAP NetWeaver - SAP Library
SAP Provided ERP Fiori apps support 16 languages as of now.
Check Masa's answer here. http://scn.sap.com/thread/3616704
If you need to add Hindi/Guj, you need to add two more i18n files for every app.
Regards
Krishna