feat(i18n): complete Hebrew locale for dev

Fill in every domain added since the first Hebrew pass (help, tours,
assistant*, studio*, wanderer*, journey, demo, ferratas and the rest),
retranslate strings whose English changed, and give every count group
its Hebrew one/two forms. Register he as a non-Latin locale for the
untranslated ratchet, add the Hebrew 429 message, and count 28 locales
in the tours locale spec.

shared/scripts/i18n-untranslated-baseline.json

@@ -130,5 +130,10 @@
     "admin.ts": { "marked": 0, "identical": 1 },
     "settings.ts": { "marked": 0, "identical": 1 },
     "system_notice.ts": { "marked": 0, "identical": 2 }
+  },
+  "he": {
+    "admin.ts": { "marked": 0, "identical": 2 },
+    "settings.ts": { "marked": 0, "identical": 1 },
+    "system_notice.ts": { "marked": 0, "identical": 1 }
   }
 }

shared/scripts/i18n-untranslated.mjs

@@ -96,7 +96,7 @@ export const KEY_NAMES = ['Ctrl'];
  * there. Every locale folder must be listed in exactly one of the two lists,
  * so a new locale cannot slip past this rule unclassified.
  */
-export const NON_LATIN_LOCALES = ['ar', 'gr', 'ja', 'ko', 'ru', 'th', 'uk', 'zh', 'zh-TW'];
+export const NON_LATIN_LOCALES = ['ar', 'gr', 'he', 'ja', 'ko', 'ru', 'th', 'uk', 'zh', 'zh-TW'];
 export const LATIN_LOCALES = [
   'az',
   'br',