Re: Some translated strings don't go to CVS repository
Not complete list of some strings from install/lang/bg/install.php file:
2.2dev [database,core_install]
2.2dev [databasehead,core_install]
2.2dev [databasehost,core_install]
2.2dev [databasename,core_install]
2.2dev [databasepass,core_install]
...
These strings are translated in AMOS database, they are translated in bg.zip language pack available from http://download.moodle.org/langpack/2.1/ (install.php file) but not in the CVS repository hire: http://cvs.moodle.org/moodle/install/lang/bg/
Re: Some translated strings don't go to CVS repository
OK, I think everything works as expected. Let me describe what I found.
Firstly note that not all strings from install.php are exported to /install/lang. Only those explicitly declared in the file /install/stringnames.txt are. For example from those you listed, only the following two strings are exported: databasehost and databasename.
The string 'databasehost' was initially translated on 2.2dev branch and it is available on HEAD branch in CVS: http://cvs.moodle.org/moodle/install/lang/bg/install.php?r1=1.5&r2=1.6&pathrev=HEAD Then it was merged into 2.1 on 2011-08-11 05:53 UTC by yourself in AMOS. But this update of 2.1 branch got into AMOSbot's git repository just a couple of hours after it was already merged into the recent weekly release. So it is now waiting at https://github.com/amosbot/moodle/compare/MOODLE_21_STABLE...install_21_STABLE and will be included in next weekly release of Moodle.
Same applies for 'databasename' string and I believe for the rest, too.
Hope this helps