This can be happen if you’ve upgraded your joomla site after joomla 1.5.15 and not upgraded the language files
so that this will look at the language file equals to this phrase and as the language file hasn’t yet upgraded or this phrase aded will endup diplaying this error
for fixing this issue go to your language files in backend that is located in

/administrator/language/languagename/language file

let say it is persian

administrator/language/fa-IR/fa-IR.ini

and just add the following at the very end of this language file

JPAGE_CURRENT_OF_TOTAL= صفحه %sاز %s

as you can see it does not have any relation or bug produced by the other third party joomla components such as phoca gallery, datso gallery or all the rest and the cause is the language file that these components work with them and use them near the pagination
you can do the same technique for udating other language files to fix this issue

THanks
voshka

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