Bugs:
1. Data exporting didn't work for Unicode locale
2. Width and height of references represented as trees were ignored
3. Filters and form search on a grouped query didn't work properly
4. Scheduler was not properly refreshed sometimes
5. Unicode fonts didn't work in reports
6. REPORT ERROR message was not translated

Improvements:
1. Default browser encoding set to UTF-8
2. When adding references with filter query, width and title is taken from the query
3. Support for operations in reference trees
4. Ability to auto-expand a tree of references
5. Visibility conditions for menu items
6. FILE_SIZE, FILE_NAME, FILE_EXTENSION, FILE_LAST_MODIFIED functions