Release v2.22.2 (#360)

Patch release for #359. No app changes.

- The Dutch store listing moved from `fastlane/metadata/android/nl` to `nl-NL`. Play rejects plain `nl`, so the Play upload of 2.22.0 and 2.22.1 failed with `nl - Invalid request`. F-Droid accepts either code.
- `check_store_listing.py` now checks every store code in `store-locales.txt` against the languages Play accepts, so CI catches this before a release.
- The 22202 "What's New" covers the 2.22 highlights, since Play users go straight from 2.21.0 to 2.22.2, and says the app is the same as 2.22.1.

Closes #359

scripts/check_store_listing.py

@@ -7,6 +7,7 @@ fail the upload after the release has shipped everywhere else.
 
   - every locale directory is listed in fastlane/store-locales.txt, and every
     app language (res/values-*) has an entry there and a directory
+  - every store code is a language Play accepts (supply's ALL_LANGUAGES)
   - title / short / full description exist, are non-empty and within Play's caps,
     and the full description isn't hard-wrapped
   - icon: 512x512 32-bit PNG; featureGraphic: 1024x500 JPEG or 24-bit PNG
@@ -29,6 +30,16 @@ SCREENSHOT_DIRS = {"phoneScreenshots", "sevenInchScreenshots", "tenInchScreensho
                    "tvScreenshots", "wearScreenshots"}
 IMAGE_EXTS = {".png", ".jpg", ".jpeg"}
 
+# fastlane supply/lib/supply/languages.rb, with `_` back to `-`.
+PLAY_LOCALES = set("""
+af am ar az-AZ be bg bn-BD ca cs-CZ da-DK de-DE el-GR en-AU en-CA en-GB en-IN
+en-SG en-US en-ZA es-419 es-ES es-US et eu-ES fa fi-FI fil fr-CA fr-FR gl-ES
+hi-IN hr hu-HU hy-AM id is-IS it-IT iw-IL ja-JP ka-GE km-KH kn-IN ko-KR ky-KG
+lo-LA lt lv mk-MK ml-IN mn-MN mr-IN ms ms-MY my-MM ne-NP nl-NL no-NO pl-PL
+pt-BR pt-PT rm ro ru-RU si-LK sk sl sr sv-SE sw ta-IN te-IN th tr-TR uk vi
+zh-CN zh-HK zh-TW zu
+""".split())
+
 errors = []
 
 
@@ -80,6 +91,10 @@ def check_mapping():
     for q in sorted(mapping.keys() - app_langs):
         error(f"{rel(MAPPING)} maps '{q}' but the app has no values-{q}")
 
+    for q, store in sorted(mapping.items()):
+        if store not in PLAY_LOCALES:
+            error(f"{rel(MAPPING)} maps '{q}' to '{store}', which Play doesn't accept as a listing language")
+
     stores = set(mapping.values())
     dirs = {d.name for d in META.iterdir() if d.is_dir()}
     for d in sorted(dirs - stores):