po: report bug + test case + proposed fix

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+[[!tag patch]]
+
+With po4a 0.58+, the po plugin incorrectly extracts UTF-8 strings from source pages.
+
+I've prepared a branch to fix this: https://salsa.debian.org/tails-team/ikiwiki/-/tree/po-fix-utf8
+
+This branch adds a test case that fails on current `master`.
+That test case passes from my branch on Debian sid with po4a 0.55 (Buster), 0.62 (Bullseye), and 0.66 (sid).