add GB lang to cspell

cspell.json

@@ -1,6 +1,7 @@
 {
   "$schema": "https://raw.githubusercontent.com/streetsidesoftware/cspell/main/cspell.schema.json",
   "version": "0.2",
+  "language": "en, en-US, en-GB",
   "files": ["**/*.md", "**/*.mdx", "**/*.tsx"],
   "dictionaryDefinitions": [
     {

project-words.txt

@@ -34,8 +34,6 @@ bantime
 barebones
 Battlemage
 BDMV
-behaviour
-behaviours
 behindthescenes
 blitter
 Blitter
@@ -67,8 +65,6 @@ clinfo
 codenames
 codesign
 collectionnumber
-colour
-colours
 comskip
 configdir
 confs