To change application's language, use Tools > Settings > Localization.

PeaZip executables doesn't need installation and can run from any 
location; a writeable path is strongly recommended to allow update of 
persistent randomness collector.

For better system integration you can consider to:
- link PeaZip in your "SendTo" path in order to be able to select form 
Explorer multiple files and folders to be sent to a single instance of 
PeaZip;
- create links to PeaZip's quick functions as explained in PeaZip help
in System integration chapter;
- use file association to make PeaZip the default application to open 
.pea archives or any other supported format (including .001, .7z, .bz2,
.gz, .tar, .zip and other ones).

Transparence effect requires at least Windows 2000 (otherwise the
program will not use transparence); Windows XP or Vista recommended 
to offer best GUI aspect