Fixed various issues related to title names：
1. If console language is set to non-English, the title names in Title Manager may be empty.
2. Game list do not show custom names if list style set to icon or small icon.
3. Custom title names for some languages (like JP or CN) appear confusing if re-edited.
4. Unexpected overrides of variable values in ParsedMetaXml.h
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
