Enable "per-PR" async PR mode (Shopify#2488)

Author: Al-Campuzano

translation.yml

@@ -1,6 +1,7 @@
 source_language: en
 target_languages: [bg-BG, cs, da, de, el, es, fi, fr, hr-HR, hu, id, it, ja, ko, lt-LT, nb, nl, pl, pt-BR, pt-PT, ro-RO, ru, sk-SK, sl-SI, sv, th, tr, vi, zh-CN, zh-TW]
 non_blocking_languages: []
+async_pr_mode: per_pr
 components:
   - name: buyer
     audience: buyer