Fix failing command tests

- Detailed description missing period
- Fix twice defined /authme delete
- Add executable command to HelpSyntaxHelperTest initializations
- Remove unneeded constructors in CommandDescription

src/main/java/fr/xephi/authme/command/CommandDescription.java

@@ -59,19 +59,6 @@ public class CommandDescription {
      */
     private CommandPermissions permissions;
 
-    /**
-     * Constructor.
-     *
-     * @param executableCommand   The executable command, or null.
-     * @param label               Command label.
-     * @param description         Command description.
-     * @param detailedDescription Detailed comment description.
-     * @param parent              Parent command.
-     */
-    public CommandDescription(ExecutableCommand executableCommand, String label, String description, String detailedDescription, CommandDescription parent) {
-        this(executableCommand, label, description, parent, detailedDescription, null);
-    }
-
     /**
      * Constructor.
      *
@@ -85,25 +72,6 @@ public class CommandDescription {
         this(executableCommand, labels, description, detailedDescription, parent, null);
     }
 
-    /**
-     * Constructor.
-     *
-     * @param executableCommand   The executable command, or null.
-     * @param label               Command label.
-     * @param description         Command description.
-     * @param parent              Parent command.
-     * @param detailedDescription Detailed comment description.
-     * @param arguments           Command arguments.
-     */
-    public CommandDescription(ExecutableCommand executableCommand, String label, String description, CommandDescription parent, String detailedDescription, List<CommandArgumentDescription> arguments) {
-        setExecutableCommand(executableCommand);
-        this.labels = Collections.singletonList(label);
-        this.description = description;
-        this.detailedDescription = detailedDescription;
-        setParent(parent);
-        setArguments(arguments);
-    }
-
     /**
      * Constructor.
      *

src/main/java/fr/xephi/authme/command/CommandManager.java

@@ -81,7 +81,7 @@ public class CommandManager {
         // Register the unregister command
         CommandDescription unregisterCommand = CommandDescription.builder()
             .executableCommand(new UnregisterCommand())
-            .labels("unregister", "unreg", "unr", "delete", "del")
+            .labels("unregister", "unreg", "unr")
             .description("Unregister a player")
             .detailedDescription("Unregister the specified player.")
             .parent(authMeBaseCommand)
@@ -117,7 +117,7 @@ public class CommandManager {
             .executableCommand(new LastLoginCommand())
             .labels("lastlogin", "ll")
             .description("Player's last login")
-            .detailedDescription("View the date of the specified players last login")
+            .detailedDescription("View the date of the specified players last login.")
             .parent(authMeBaseCommand)
             .permissions(OP_ONLY, AdminPermission.LAST_LOGIN)
             .withArgument("player", "Player name", true)