Heads up to all the modders. Now when OpenXcom runs into something missing in a mod, like a sprite or an item or something, it will no longer just unexplicably crash. Instead it'll show a much more helpful "STR_FOO_BAR not found" message, and then crash. Hopefully that should help you find your typos more easily without me having to break out the debugger.
Anyways it's possible I've added too much error checking, so modders and players using mods, keep an eye out for any "not found" error messages that shouldn't be happening and report them please.