Updated Russian translation (thanks to toiffel).
Fixed cursor not being visible in some cases after file is loaded (ref #116).
Fixed wrong tab activated on OSX after using New file in some cases.

This is caused by two PAGE_CHANGED event for the notebook triggered
when the current tab is not the last one (in wx2.9.5+). This could lead to
a crash if the incorrect tab is closed (ref #89).
Fixed 'control' check on OSX that changed with wx2.9.2+ (ref #89).
Added line copy/cut for Ctrl-C/Ctrl-X with no selection.
Added handling of Ctrl-Home and Ctrl-End on OSX (ref #89).