chore: sync .mokogitea/workflows/pr-check.yml from moko-platform [skip ci]

.mokogitea/workflows/pr-check.yml

@@ -202,10 +202,47 @@ jobs:
           ERRORS=0
           WARNINGS=0
 
+          # Require both en-GB and en-US language directories
+          LANG_ROOT=$(find . -path "*/language" -type d -not -path "./.git/*" 2>/dev/null | head -1)
+          if [ -z "$LANG_ROOT" ]; then
+            echo "No language/ directory found — skipping"
+            exit 0
+          fi
+
+          if [ ! -d "$LANG_ROOT/en-GB" ]; then
+            echo "::error::Missing en-GB language directory (${LANG_ROOT}/en-GB)"
+            ERRORS=$((ERRORS + 1))
+          fi
+          if [ ! -d "$LANG_ROOT/en-US" ]; then
+            echo "::error::Missing en-US language directory (${LANG_ROOT}/en-US)"
+            ERRORS=$((ERRORS + 1))
+          fi
+
+          # Check that en-GB and en-US have matching .ini files
+          if [ -d "$LANG_ROOT/en-GB" ] && [ -d "$LANG_ROOT/en-US" ]; then
+            for GB_INI in "$LANG_ROOT/en-GB"/*.ini; do
+              [ ! -f "$GB_INI" ] && continue
+              US_INI="$LANG_ROOT/en-US/$(basename "$GB_INI")"
+              if [ ! -f "$US_INI" ]; then
+                echo "::error::$(basename "$GB_INI") exists in en-GB but missing from en-US"
+                ERRORS=$((ERRORS + 1))
+              fi
+            done
+            for US_INI in "$LANG_ROOT/en-US"/*.ini; do
+              [ ! -f "$US_INI" ] && continue
+              GB_INI="$LANG_ROOT/en-GB/$(basename "$US_INI")"
+              if [ ! -f "$GB_INI" ]; then
+                echo "::error::$(basename "$US_INI") exists in en-US but missing from en-GB"
+                ERRORS=$((ERRORS + 1))
+              fi
+            done
+          fi
+
           # Find all .ini language files
           INI_FILES=$(find . -path "*/language/*/*.ini" -not -path "./.git/*" 2>/dev/null)
           if [ -z "$INI_FILES" ]; then
-            echo "No .ini language files found — skipping"
+            echo "No .ini language files found"
+            [ "$ERRORS" -gt 0 ] && exit 1
             exit 0
           fi