Update 'doc/.tx/config' - Build #69

  http://cookingwithsalt.org/job/salt/job/transifex/69/

Signed-off-by: Pedro Algarvio <pedro@algarvio.me>
Fix merge_if_exists in states.file.serialize

This feature was recently added, but about two weeks before it was
added, this state started importing salt.utils.{yaml,json} as yaml/json.
This makes the yaml.load (or json.load) fail since these functions are
not in the serializer modules.

This fixes merge_if_exists by importing the serializer modules for yaml
and json under a different namespace, allowing the yaml and json modules
to also be loaded.

It also makes the change to using yaml.safe_load, and also adds a
versionadded directive for merge_if_exists.
Merge pull request #13153 from s0undt3ch/hotfix/transifex-updates

Update 'doc/.tx/config' - Build #69
Merge pull request #13159 from s0undt3ch/develop

Ensure correct syspath
Merge pull request #13158 from terminalmage/issue13137

Fix merge_if_exists in states.file.serialize
Json is not going through serializers anymore. Refs #13158