Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 2c491d2e14deba9f13a52ef658b308fb5067f26c
  - json i18n text properties for English and Chinese
    
    Issue-ID: USECASEUI-387
    
    Signed-off-by: seshukm <seshu.kumar.m@huawei.com>
    Change-Id: I9eea0227d3d4d3bd1d2aa154eb0c8f1016c3ae20
    
1 file changed