Thanks for your readiness to share. However, you file is not only a partial translation, but just incomplete (the file ends in mid-air - the last line with the line number 5193 is
$lang_pl). This is probably a result of an issue during upload when attaching the file. Please try again to attach the file, as suggested in
http://documentation.coppermine-gallery.net/en/translation.htm#translation_step_by_stepAdditionally, it contains double line-breaks (which usually is a result of using an editor that is not fit for the task, see
http://documentation.coppermine-gallery.net/en/dev_tools.htm#dev_tools_editor), but we'll be able to figure that issue out once you have provided a complete file.
Your translation appears to be based on an old, outdated copy of the English language file (see
http://documentation.coppermine-gallery.net/en/translation.htm#translation_work_in_progress), which is not ideal, but hopefully we'll be able to figure this out as well.
Your file contains translations of things that mustn't be translated (like the SVN file header, see
http://documentation.coppermine-gallery.net/en/dev_subversion.htm#dev_subversion_fileheaders).
the file is save as "txt" only rename to "php". Php file not send here :-)
Allowing the upload of files with the extension "php" would be a security risk, that's why you can't upload/attach files named that way. As suggested in
http://documentation.coppermine-gallery.net/en/translation.htm#translation_step_by_step you should either zip your translation or just rename it from czech.php to czech.php.txt and then attach it.
Bottom line: we're looking forward to see your translation, please try again.