update ibc references (#736)

docs/gaia-tutorials/what-is-gaia.md

@@ -17,7 +17,7 @@ order: 1
 - `x/distribution`: Fee distribution logic.
 - `x/slashing`: Slashing logic.
 - `x/gov`: Governance logic.
-- `x/ibc`: Inter-blockchain transfers.
+- `ibc-go/modules`: Inter-blockchain communication. Hosted in the `cosmos/ibc-go` repository. 
 - `x/params`: Handles app-level parameters.
 
 About the Cosmos Hub: The Cosmos Hub is the first Hub to be launched in the Cosmos Network. The role of a Hub is to facilitate transfers between blockchains. If a blockchain connects to a Hub via IBC, it automatically gains access to all the other blockchains that are connected to it. The Cosmos Hub is a public Proof-of-Stake chain. Its staking token is called the Atom.

docs/translations/cn/what-is-gaia.md

@@ -14,7 +14,7 @@
 + `x/distribution` : 费用分配逻辑
 + `x/slashing` : 处罚逻辑
 + `x/gov` : 治理逻辑
-+ `x/ibc` : 跨链交易
++ `ibc-go/modules` : 跨链交易
 + `x/params` : 处理应用级别的参数
 
 > 关于Cosmos Hub : Cosmos Hub是第一个在Cosmos Network中上线的枢纽。枢纽的作用是用以跨链转账。如果区块链通过IBC协议连接到枢纽，它会自动获得对其它连接至枢纽的区块链的访问能力。Cosmos Hub是一个公开的PoS区块链。它的权益代币称为Atom。

docs/translations/es/what-is-gaia.md

@@ -18,7 +18,7 @@ order: 1
 - `x/distribution`: Lógica para la distribución del FEE.
 - `x/slashing`: Lógica para la penalización.
 - `x/gov`: Lógica para la gobernanza.
-- `x/ibc`: Transferencia entre blockchains.
+- `ibc-go/modules`: Transferencia entre blockchains.
 - `x/params`: Controla los parámetros del nivel de la aplicación.
 - `x/capability`:
 - `x/crisis`:

docs/translations/kr/what-is-gaia.md

@@ -14,7 +14,7 @@
 - `x/distribution`: 수수료(보상) 분배 로직(fee distribution logic)
 - `x/slashing`: 슬래싱 로직
 - `x/gov`: 거버넌스 로직
-- `x/ibc`: 인터블록체인 전송
+- `ibc-go/modules`: 인터블록체인 전송
 - `x/params`: 앱레벨 파라미터 관리