RankTable.pm: translate comments, fix whitespace
Fix protection against displaying results of practice contest
Security: Do not display rank table for hidden contests
Clear rank cache after changing contest parameters
Remove problems_new frame, obsoleted by problems_add_new
Translate success/error messages on problem replacement
Improve and translate errors on submitting empty solution
Die on unknown res_str
Highlight selected menu item even when not visited
Fix whitespace in contests- and problems-related subs
Translate and renumber messages on problem submission
Remember selected problem
Use and translate a message on contest deletion
Add 'used in contests' view for problems
Allow different max_points for different contests
Clear max_points cache after changes to problem or testset
RankTable: Remove duplicate conditions
Translate 'view_source' page
main: Translate some comments
StaticPages: Minor refactoring