feat: add \translate-resync support to sync workflows (#492)

* feat: add issue_comment trigger for \translate-resync support

Add issue_comment trigger to both sync-translations workflows so that
commenting \translate-resync on a merged PR re-triggers translation
sync. This enables recovery from transient sync failures without
re-opening PRs.

Companion to QuantEcon/action-translation#39.

* chore: bump action-translation to v0.12.0

Author: mmcky

.github/workflows/sync-translations-fa.yml

@@ -1,5 +1,6 @@
 # Sync Translations — Farsi
 # On merged PR, translate changed lectures into the Farsi target repo.
+# Comment \translate-resync on a merged PR to re-trigger sync.
 name: Sync Translations (Farsi)
 
 on:
@@ -8,18 +9,22 @@ on:
     paths:
       - 'lectures/**/*.md'
       - 'lectures/_toc.yml'
+  issue_comment:
+    types: [created]
 
 jobs:
   sync:
-    if: github.event.pull_request.merged == true
+    if: >
+      (github.event_name == 'pull_request' && github.event.pull_request.merged == true) ||
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '\translate-resync'))
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
-      - uses: QuantEcon/action-translation@v0.11.2
+      - uses: QuantEcon/action-translation@v0.12.0
         with:
           mode: sync
           target-repo: QuantEcon/lecture-python-programming.fa

.github/workflows/sync-translations-zh-cn.yml

@@ -1,5 +1,6 @@
 # Sync Translations — Simplified Chinese
 # On merged PR, translate changed lectures into the zh-cn target repo.
+# Comment \translate-resync on a merged PR to re-trigger sync.
 name: Sync Translations (Simplified Chinese)
 
 on:
@@ -8,18 +9,22 @@ on:
     paths:
       - 'lectures/**/*.md'
       - 'lectures/_toc.yml'
+  issue_comment:
+    types: [created]
 
 jobs:
   sync:
-    if: github.event.pull_request.merged == true
+    if: >
+      (github.event_name == 'pull_request' && github.event.pull_request.merged == true) ||
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '\translate-resync'))
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 2
 
-      - uses: QuantEcon/action-translation@v0.11.2
+      - uses: QuantEcon/action-translation@v0.12.0
         with:
           mode: sync
           target-repo: QuantEcon/lecture-python-programming.zh-cn