What versions of npm and node do you currently have installed? First, please make sure that you're using a
supported version of Node.js for DSpace 9.2. If you could also provide a more complete stack trace from the JSON5 error you're seeing, that may help narrow the problem down.
In the meantime, one thing you could try is cleaning up any cached dependencies before trying to build again:
$ npm run clean
$ npm install
Last, you could check if you have any auto-linting settings that may have unexpectedly changed the format of your `en.json5` .
Lia