The number of strings in lang files increses with versions. New strings are being added and they are (almost) never removed to preserve backward compatibility.
Languages
Tool for language maintainers
གྲོས་བསྟུན་འདི་བསྡམས་ཡོདཔ་ལས་ ལན་གསལ་བརྐྱབ་མི་ཚུགས་