Note that testing a translation needs the bundle, not the locale

Fixing the Czech plurals turned up a trap worth recording: String(localized:
locale:) reads the language from the bundle, while locale: only drives
number and date formatting. A test that passes a Czech locale and nothing
else quietly compares English strings — ours failed with "1 coupon" ==
"1 kupón", which reads as broken plurals when the plurals were fine and
the test was looking in the wrong place.

Also that a plural variation must reference the number, so a key
extracted as "%@" cannot carry one and the build says so outright.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -12,7 +12,7 @@
       "name": "pdat-swift-practice",
       "source": "./pdat-swift-practice",
       "description": "Curated Apple platform findings with sources, plus practices learned from production incidents.",
-      "version": "0.5.0",
+      "version": "0.6.0",
       "author": {
         "name": "PDAT s.r.o."
       },