Closes#729
1. Dark mode now applied correctly (was previously lacking)
2. Fixed terrain brush action (brush active is higher priority than drag, fix tile fetch)
3. Fixed writing of Building/structure labels; apply after Terrain
4. Single terrain brush form allowed, center to Field Editor on launch
Somewhat related: fix Show() load for non-ShowDialog() forms to center to parent.
jp/en/zh -- only english has been translated (duh)
keep in mind this translates the text in the program, not the internal flag names.
not sure if other languages need to be supported; from PKHeX's experience, only spanish is updated (besides jp/zh), as most users speak english or are fine using the program in english.
pls localize villager names and item names for non-english :P -- preferrably automated from raw game dumps
