Expose lobby options to localisation.

mods/cnc/languages/rules/en.ftl

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+## Player
+low = Low
+medium = Medium
+no-powers = No Powers
+unrestricted = Unrestricted
+
+redeployable-mcvs =
+    .label = Redeployable MCVs
+    .description = Allow undeploying Construction Yard
+
+stealth-deliveries =
+    .label = Stealth Deliveries
+    .description = Nod's delivery plane is cloaked
+
+## World
+mcv-only = MCV Only
+light-support = Light Support
+heavy-support = Heavy Support
+
+map-creeps =
+    .label = Creep Actors
+    .description = Hostile forces spawn on the battlefield