Broken characters in Confluence support tools menu with Russian language settings

Environment:

Confluence 6.7.1 (Linux 64bit) PostgreSQL 9.5, Chrome 64

Bug description

Broken characters in Confluence support tools menu with Russian language settings

Steps to replicate

• Click on user avatar icon -> go to "profile"
• From settings menu, select Russian language.
• Go to Confluence Administration -> Support tools (Инструменты поддержки и решения проблем)
• Click on "Generate Support.zip" menu (Создать zip-файл для поддержки)

Expected results

All support.zip components are correctly translated/displayed

Actual results

Some components contain invalid characters: