For an english 'prio' game jam, you should code it in English first and use the 48 hours after submission time to put in localisation options. This makes it so you can complete your game but make it more accessible for others later. These 48 hours are meant for these kind of things, or build time for other platforms is also used frequently used in this 48 hours, or like we had our first time doing a game jam.. not being able to start up the game fixes haha.
Make sure to always keep the original file included if you do this. :)