fix(locale): quote cs.yml island-chat-spy syntax to fix malformed YAML

The island-chat-spy syntax line contained an unquoted `: ` (colon+space)
which YAML interprets as a mapping separator, causing a parse error on
startup. Quoted the value to match the already-quoted team-chat-spy line.

Fixes BentoBoxWorld/BentoBox#2953

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tastybento

src/main/resources/locales/cs.yml

@@ -25,4 +25,4 @@ chat:
       description: "Přepnout šmírování chatů na všech ostrovech"
       spy-on: <green>Šmírování chatů na ostrovech zapnuto</green>
       spy-off: <red>Šmírování chatů na ostrovech vypnuto</red>
-      syntax: <red>[island-chat-spy]</red> <dark_red>[name]</dark_red>: [message]
+      syntax: "<red>[island-chat-spy]</red> <dark_red>[name]</dark_red>: [message]"