If we can add "if" statements to lang phrases...
I do something similar in WBB 4.0 - but there I could...
Example in polish language for stats from WBB:
{#$stats[members]} użytkownik{if $stats.members != 1}ów{/if} - {#$stats[threads]} temat{if $stats[threads] == 1}{elseif $stats[threads] ==...