Hi Sharma Ji.
You can refer the SAP languages links and SAP Notes for Hindi & Marathi Language support on NW 7.4 system.
Refer the SAP Languages list link https://websmp106.sap-ag.de/languages and
Hindi SAP Note 1753671 - Restrictions and recommendations for Hindi
Marathi Language - 895560 - Support for languages only available in Unicode systems
Regards
SS