-Fix: Don't use GCC diagnostic push/pop if unsupported

git-svn-id: http://svn.openttd.org/trunk@27040 6aa0318a-3be1-0310-93fa-89fd2396df07
-Update: ob* translations


git-svn-id: http://svn.openttd.org/trunk@27041 6aa0318a-3be1-0310-93fa-89fd2396df07
-Update from WebTranslator v3.0:
irish - 265 changes by tem


git-svn-id: http://svn.openttd.org/trunk@27042 6aa0318a-3be1-0310-93fa-89fd2396df07
-Fix: could not enter third digit of snow line height


git-svn-id: http://svn.openttd.org/trunk@27043 6aa0318a-3be1-0310-93fa-89fd2396df07
-Change (r26905, r26984): Scale heightmap greyscales > 0 evenly to heightlevels > 0, instead of giving heightlevel 1 a bigger loading. Sea level remains at pure black only.

git-svn-id: http://svn.openttd.org/trunk@27044 6aa0318a-3be1-0310-93fa-89fd2396df07