Custom rules dialog enhancement, small fixes (#9665)

* Rule categories and search in custom rules dialog

* Fix wrong info about format placeholders in all unfinished locales

* Rule search fix, rule info system, some stuff for easier rules dialog modding

* Why not to fix what i can?

core/src/mindustry/editor/MapLocalesDialog.java

@@ -5,7 +5,6 @@ import arc.func.*;
 import arc.graphics.*;
 import arc.scene.style.*;
 import arc.scene.ui.*;
-import arc.scene.ui.Button.*;
 import arc.scene.ui.TextButton.*;
 import arc.scene.ui.layout.*;
 import arc.scene.utils.*;