fix(ci): support HTML comment VERSION format, add en-GB/en-US check

- Release readiness: support <!-- VERSION: XX.YY.ZZ --> format in
  README.md (not just FILE INFORMATION block format)
- Add language directory check: verify en-GB and en-US exist in all
  language/ directories under src/ or htdocs/

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.mokogitea/workflows/ci-joomla.yml

@@ -202,6 +202,37 @@ jobs:
             echo "**Language file check passed.**" >> $GITHUB_STEP_SUMMARY
           fi
 
+      - name: Check en-GB and en-US language directories exist
+        run: |
+          echo "### Language Directory Check" >> $GITHUB_STEP_SUMMARY
+          ERRORS=0
+
+          for DIR in src/ htdocs/; do
+            [ -d "$DIR" ] || continue
+            # Find all language directories
+            while IFS= read -r -d '' LANG_DIR; do
+              HAS_GB=false
+              HAS_US=false
+              [ -d "${LANG_DIR}/en-GB" ] && HAS_GB=true
+              [ -d "${LANG_DIR}/en-US" ] && HAS_US=true
+              if [ "$HAS_GB" = false ]; then
+                echo "Missing \`en-GB\` in: \`${LANG_DIR}\`" >> $GITHUB_STEP_SUMMARY
+                ERRORS=$((ERRORS + 1))
+              fi
+              if [ "$HAS_US" = false ]; then
+                echo "Missing \`en-US\` in: \`${LANG_DIR}\`" >> $GITHUB_STEP_SUMMARY
+                ERRORS=$((ERRORS + 1))
+              fi
+            done < <(find "$DIR" -type d -name "language" -print0)
+          done
+
+          if [ "${ERRORS}" -gt 0 ]; then
+            echo "**${ERRORS} missing language director(ies).**" >> $GITHUB_STEP_SUMMARY
+            exit 1
+          else
+            echo "All language directories have en-GB and en-US." >> $GITHUB_STEP_SUMMARY
+          fi
+
       - name: Check index.html files in directories
         run: |
           echo "### Index.html Check" >> $GITHUB_STEP_SUMMARY
@@ -245,8 +276,8 @@ jobs:
           echo "" >> $GITHUB_STEP_SUMMARY
           ERRORS=0
 
-          # Extract version from README.md
-          README_VERSION=$(grep -oP '^\s*VERSION:\s*\K[0-9]{2}\.[0-9]{2}\.[0-9]{2}' README.md | head -1)
+          # Extract version from README.md (supports both FILE INFORMATION block and HTML comment format)
+          README_VERSION=$(grep -oP 'VERSION:\s*\K[0-9]{2}\.[0-9]{2}\.[0-9]{2}' README.md | head -1)
           if [ -z "$README_VERSION" ]; then
             echo "No VERSION found in README.md FILE INFORMATION block." >> $GITHUB_STEP_SUMMARY
             ERRORS=$((ERRORS + 1))