outdated strings

[wensimehrp]

https://github.com/OpenTTD-JPplus/JPplusMU/blob/master/lang/english.lng contains a lot of outdated and unused strings. Good news is that recent changes from NML (OpenTTD/nml#348) allows listing unused strings in the LNG file.
That feature requires the latest git version though, but it should be easy to set up (i.e. git pull https://github.com/openttd/nml and python3 ./nml/nmlc blahblahfile.nml)

Those outdated strings are a big problem for translators, as they won't know which strings should be translated.

[Tintinfan]

Very aware, the liveries all need to be re-done as orginally it was changed from listing each livery correctly to have "livery variation" as we got worried we would run out of strings. That isn't the case now with compound strings and re-using strings.... so this is to be reversed.

The entire file is to be re-done as per issue #2 and thanks for the heads up, the nml change will make this ALOT easier.

When? Hmm...