I found that in the
rsgallery2.xml file has on line 50 and 113 reference to a en-US.com_rsgallery2.ini not the en-GB.com_rsgallery2.ini file since their is no US file.
<language tag="en-US">en-US.com_rsgallery2.ini</language>
Received the following errors on install even after fixing the xml file:


I then created the the directories
mydomain/components/com_rsgallery2/language and
mydomain/administrator/components/com_rsgallery2/language and uploaded the en-GB.com_rsgallery2 file.
Also had to created the following directories : mydomain/images/rsgallery, mydomain/images/rsgallery/orginials, mydomain/images/rsgallery/thumb, mydomain/images/rsgallery/watermarked
Looks like everything is working now, but I only knew about the language problems seeing it in other CMS systems. I don't know what needs to be changed to have the installer created the language directory when installing RSGallery2.
Site info:
Apache/2.0.61 (Unix) PHP/5.2.6 mod_ssl/2.0.61 OpenSSL/0.9.7e mod_fastcgi/2.4.2
Joomla! 1.5.6 Production/Stable [ Vusani ] 12-August-2008 22:00 GMT
MySQL 5.0.67-log
If you need any other info, just let me know.
-RM