April 21, 2011 Patch

{{Patch layout
 * source      = http://store.steampowered.com/news/5341/
 * source-title = Portal 2 Update Released
 * before      = April 19, 2011 Patch
 * after       = N/A
 * notes       =

Portal 2
}}
 * Fixed unrecoverable black screen in elevator save
 * Fixed infinite loop on Mac OSX server
 * Fixed Mac OSX font rendering and glyph corruption
 * Fixed GC memory leak
 * Various localization content improvements
 * Support for English subtitles in Turkish builds
 * Minor string/interface glitches
 * Fixes for multiple crashes
 * Improved detection and handling for various errors and/or crashes
 * Activated UI to enable joystick in-game