This fixes the issue with the huge number display inside the kill info.

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Add a new function to your mission, for example easily via this small snippet pasted inside initplayerlocal.sqf. This function will then take care of the number formatting.
{ missionNamespace setVariable [(_x #0), compileScript [_x #1]]; } forEach [ ["ExileClient_util_string_exponentToStringFormatted","custom\ExileClient_util_string_exponentToStringFormatted.sqf"] ]; -
Download ExileClient_gui_hud_showKillDetails and put it to your missionfile and add the CfgExileCustomCode entry for it in your missions config.cpp.
ExileClient_gui_hud_showKillDetails = "Overrides\ExileClient_gui_hud_showKillDetails.sqf"; -
Done
Can also easily be added to other scripts to show the huge numbers better (The output is a string!)
// Example for ExileClient_gui_lockerDialog_event_onDepositButtonClick
throw format ["Your locker can only hold %1 pop tabs.", (_lockerLimit call ExileClient_util_string_exponentToStringFormatted)];
And don't go to crazy with the numbers, stay below 1,000,000,000 (Otherwise it will not be precise / Arma limitation!).

Some more "big number" fixes can be found in the Optional folder.