In large property files (>1000 entries) it if often the
case that there are double/similar entries.
It wold be nice, if you enter values for a specific
language key, then this language file is searched for
similar entries and somewhere a hint is diplayed that
"a similar entry with the key XY exists", or, if there
is more than one similar entry, a list of similar
entries is displayed.
That way double/multiple entries could be avoided.