I want to make my own language file for my installer. I want to make my installer which will support two languages "English" and "Hindi". But there is no language file for hindi. So I want to make my own language file for hindi. Can anyone tell me how to make it and how to link it with NSIS? And what is ".nlf" files e.g "English.nlf" present in the NSIS Contrib folder?
The .nlf files inside Contrib\Language files are storing all default dialogs used by NSIS. The .nsh files in the same folder are used by installers with Modern UI. I'd clone the files for English translation (or any other language you prefer as starting point) and change all the strings inside.
For your convenience, there are packages available for Sublime Text and Atom, that let you jump between each translation field.