[PagePreparation] Files handled as a part of page preparation

The files are prepared for translation by adding translate tags around
translatable content. A function has been written to retrieve the
namespace aliases and the returned aliases are used to build the regex.

Change-Id: I61e3a89a1d013ce88a03b3f42abd7c535dbd797f
Merge "[PagePreparation] Files handled as a part of page preparation"