The icon view was all broken from having entries inserted with non
loaded icons, resulting in a layout that had the wrong size and no
obvious way to trigger a resizing without incurring a costly window
redraw.
Solution: When the icon is not yet loaded insert a transparent
placeholder icon.
* Make PPC threads/texture cache info window columns untranslatable
* Make several window titles translatable
* Make About window text translatable
* Fix <profile name> placeholder not being recognized as translatable
* Miscellaneous improvements to GUI strings
* Add a few missing entries to gitignore
* Adjust Italian translation of Linux files
