-Update from WebTranslator v3.0:
english_AU - 1 changes by mrtux
frisian - 94 changes by Geoloep
korean - 66 changes by Phryxia
latvian - 19 changes by okama2
marathi - 42 changes by rbarde


git-svn-id: http://svn.openttd.org/trunk@26293 6aa0318a-3be1-0310-93fa-89fd2396df07
-Change: [NewGRF] Make vehicle variable 61 return 'not available' instead of zero when using it in invalid callback contexts.

git-svn-id: http://svn.openttd.org/trunk@26294 6aa0318a-3be1-0310-93fa-89fd2396df07