build(common): mark locales files as side-effect-full

[IgorMinar]

These files are in the UMD format for greater portablity, and as such
can't be marked as side-effect-free by webpack/build-optimizer/uglify.

[IgorMinar]

I manually verified that the package.json makes it through

[mary-poppins]

You can preview b92ca62 at https://pr23366-b92ca62.ngbuilds.io/.

[mary-poppins]

You can preview 6183c12 at https://pr23366-6183c12.ngbuilds.io/.

[alexeagle]

add "description": "Workaround for [issue] that makes BuildOptimizer not mark these UMD files as @PURE"

[mary-poppins]

You can preview 575a647 at https://pr23366-575a647.ngbuilds.io/.

[ngbot]

I see that you just added the PR action: merge label, but the following checks are still failing:
     status "continuous-integration/travis-ci/pr" is failing
     status "google3" is pending

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If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

[angular-automatic-lock-bot]

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