Copy events-widget.tmpl to events-widget-mt5.tmpl, to be modified for MT5.
Add legacy tmpl/cms/include/calendar.tmpl file, removed from MT 5.1+ distributions.
Add legacy .calendar .css styles to calendar.tmpl. Taken from legacy MT 4.3x mt-static/css/structure.css.

Added a few additonal legacy .css styles for calendar.tmpl (.pkg, .left, .right styles), taken from legacy MT 4.3x mt-static/css/main.css.
Modify inline .css styles in events-widget-mt5.tmpl so Events sidebar widget displays correctly and in proper position in MT5.
Add basic L10N support - currently English only.
Modify template_source.edit_entry callback code: If running on MT 5, load alternate calendar.tmpl and event-widget-mt5.tmpl templates, then have plugin immediately translate <__trans> tags in those templates.
Add L10N files to support localization of calendar.
Bump plugin version number to 0.3.