Highlight BUILD.bazel as python

Bazel supports both BUILD and BUILD.bazel files and in this issue: [1]
there is a discussion to prefer BUILD.bazel over BUILD naming
convention. Detect BUILD.bazel files as Python code in addition to
BUILD files.

[1] bazelbuild/bazel#4517

Change-Id: Iabc719b914fcd08ef6e73c314f09f924540c3794

resources/com/google/gerrit/server/mime/mime-types.properties

@@ -13,6 +13,7 @@ bucklet = text/x-python
 bzl = text/x-python
 BUCK = text/x-python
 BUILD = text/x-python
+BUILD.bazel = text/x-python
 c = text/x-csrc
 cfg = text/x-ttcn-cfg
 cl = text/x-common-lisp