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i18n: fix coding tag unsupported by xgettext

Running `make update-pot` currently fails with the following error:

xgettext: mercurial/metadata.py:1: Unknown encoding "utf8". Proceeding with ASCII instead.
xgettext: Non-ASCII string at mercurial/metadata.py:311.
          Please specify the source encoding through --from-code or through a comment
          as specified in http://www.python.org/peps/pep-0263.html.

Differential Revision: https://phab.mercurial-scm.org/D9260

--HG--
branch : stable
13 jobs for 5.6 in 35 minutes (queued for 4 minutes and 53 seconds)
latest
Status Name Job ID Coverage
  Test
passed checks-py2 #118375

00:03:47

passed checks-py3 #118376

00:05:45

passed rust-cargo-test-py2 #118377

00:02:30

passed rust-cargo-test-py3 #118378

00:02:34

passed rust-cargo-test-py3-dirstate-tree #118379

00:02:11

passed test-py2 #118380

00:26:29

passed test-py2-chg #118387

00:22:22

passed test-py2-pure #118382

00:19:05

passed test-py2-rust #118384

00:21:31

passed test-py3 #118381

00:13:23

passed test-py3-pure #118383

00:19:42

passed test-py3-rust #118385

00:22:24

passed test-py3-rust-dirstate-tree #118386

00:22:17