Convert all UK spelling to US (#2138)

* all the ise

* forgot a misspelling

* a few more replacements

* bump impl

* rollback and fixes

* bump impl again

* Add aliases for RPC

* Update on_demand.rs

substrate/srml/staking/src/lib.rs

@@ -414,7 +414,7 @@ decl_storage! {
 		/// The length of the bonding duration in blocks.
 		pub BondingDuration get(bonding_duration) config(): T::BlockNumber = T::BlockNumber::sa(1000);
 
-		/// Any validators that may never be slashed or forcibly kicked. It's a Vec since they're easy to initialise
+		/// Any validators that may never be slashed or forcibly kicked. It's a Vec since they're easy to initialize
 		/// and the performance hit is minimal (we expect no more than four invulnerables) and restricted to testnets.
 		pub Invulnerables get(invulnerables) config(): Vec<T::AccountId>;
 
@@ -915,7 +915,7 @@ impl<T: Trait> Module<T> {
 			Self::slashable_balance_of,
 			min_validator_count,
 			ElectionConfig::<BalanceOf<T>> {
-				equalise: false,
+				equalize: false,
 				tolerance: <BalanceOf<T>>::sa(10 as u64),
 				iterations: 10,
 			}
@@ -960,7 +960,7 @@ impl<T: Trait> Module<T> {
 	}
 
 	/// Call when a validator is determined to be offline. `count` is the
-	/// number of offences the validator has committed.
+	/// number of offenses the validator has committed.
 	///
 	/// NOTE: This is called with the controller (not the stash) account id.
 	pub fn on_offline_validator(controller: T::AccountId, count: usize) {