Various code simplification/fixes and a lot of typo/grammar fixes (may brake some stuff)

pandalib-ws/src/main/java/fr/pandacube/lib/ws/payloads/LoginPayload.java

@@ -1,7 +1,7 @@
 package fr.pandacube.lib.ws.payloads;
 
 /**
- * Payload used by the client to login to key-protected websocket endpoint.
+ * Payload used by the client to log in to key-protected websocket endpoint.
  */
 public class LoginPayload extends Payload {
     /**

pandalib-ws/src/main/java/fr/pandacube/lib/ws/payloads/LoginSucceedPayload.java

@@ -1,7 +1,7 @@
 package fr.pandacube.lib.ws.payloads;
 
 /**
- * Payload used by the server in inform the client the login was successfull.
+ * Payload used by the server in inform the client the login was successful.
  */
 public class LoginSucceedPayload extends Payload {
 }

pandalib-ws/src/main/java/fr/pandacube/lib/ws/payloads/MessagePayload.java

@@ -10,7 +10,7 @@ public class MessagePayload extends Payload {
     public String message;
 
     /**
-     * Initialite a new MessagePayload with the provided message.
+     * Initialize a new MessagePayload with the provided message.
      * @param message the message.
      */
     public MessagePayload(String message) {