[zanata/zanata-platform] b82adc: fix(ZNTA-975): add missing Strings dependency

[GitHub]

  Branch: refs/heads/damason/advanced-search/ZNTA-975
  Home:   https://github.com/zanata/zanata-platform
  Commit: b82adcc0b276681519b7f28984815002709a49db
      https://github.com/zanata/zanata-platform/commit/b82adcc0b276681519b7f28984815002709a49db
  Author: David Mason <drdmason at gmail.com>
  Date:   2017-08-10 (Thu, 10 Aug 2017)

  Changed paths:
    M server/services/src/main/java/org/zanata/util/DateUtil.java

  Log Message:
  -----------
  fix(ZNTA-975): add missing Strings dependency

This was removed by accident when resolving a merge conflict.