Following up on the latest beta:
Thanks to Wollino for reporting the issue with the language DLL not being loaded correctly after the DLL had been updated with Resource Hacker. It turns out Resource Hacker was making a changes to some resources that mIRC had to take account of.
Regarding the dialog/control resizing issue:
As I mentioned in the beta.txt, most dialogs/controls are tightly sized/fitted to English words. It will be impossible for longer translated text to fit in many cases. Because of this, I have decided to resize every dialog (about 120 of them) and their controls to cater for generically longer text. This will mean that most dialogs will be larger, more spaced out, and more consistent in design.
In some cases, eg. the Options/IRC dialog, which has no space at all to properly fit larger controls, I may have to enlarge the Options dialog significantly, or move some items into new sections/dialogs. One other option is to change the Options/IRC/Options dialog to host a listbox of settings with checkboxes, to enable/disable different settings. On the plus side, this would allow me to add new settings in future without worrying about redesigning dialogs or squeezing controls into limited space.
In any case, this next stage of adding multi-language support is going to take some time :-]