[zanata/zanata-server] 39a612: Improve some error messages

[GitHub]

  Branch: refs/heads/bad-error-messages
  Home:   https://github.com/zanata/zanata-server
  Commit: 39a61244d23b42dd6536128564e944321fcdcd4d
      https://github.com/zanata/zanata-server/commit/39a61244d23b42dd6536128564e944321fcdcd4d
  Author: Damian Jansen <djansen at redhat.com>
  Date:   2016-10-06 (Thu, 06 Oct 2016)

  Changed paths:
    M zanata-war/src/main/java/org/zanata/webtrans/client/resources/RpcMessages.java
    M zanata-war/src/main/java/org/zanata/webtrans/client/resources/UiMessages.java

  Log Message:
  -----------
  Improve some error messages