diff --git a/.github/scripts/check_l10n.php b/.github/scripts/check_l10n.php
new file mode 100644
index 0000000..482034a
--- /dev/null
+++ b/.github/scripts/check_l10n.php
@@ -0,0 +1,56 @@
+<?php
+
+
+
+
+if( !isset($argv) || count($argv)<=1 ) {
+    phpDie("Usage: php ".__FILE__." /path/to/resources/l10n");
+    exit(1);
+}
+
+$resourceDir = $argv[1];
+
+if( !is_dir($resourceDir) ) {
+    phpDie( $resourceDir." is not a dir" );
+}
+
+if( !file_exists( $resourceDir."/labels.properties")) {
+    phpDie( $resourceDir." is missing default labels.properties file" );
+}
+
+$defaultLang = parse_ini_file($resourceDir."/labels.properties", false, INI_SCANNER_RAW);
+
+//print_r($defaultLang);
+
+if( empty($defaultLang)) {
+    phpDie( "labels.properties is invalid or empty" );
+}
+
+$langFiles = glob($resourceDir."/labels_*");
+
+$errors = 0;
+
+foreach( $langFiles as $langfile ) {
+    $checkLang = parse_ini_file($langfile, false, INI_SCANNER_RAW);
+    if( empty($checkLang)) {
+        echo $langfile." is invalid or empty".PHP_EOL;
+        $errors++;
+
+    }
+    foreach( $defaultLang as $l10nKey => $l10nval ) {
+        if( !isset($checkLang[$l10nKey]) || empty($checkLang[$l10nKey]) ) {
+            echo basename($langfile)." is missing translation for key ".$l10nKey.PHP_EOL;
+            $errors++;
+        }
+    }
+}
+
+if( $errors > 0 ) {
+    phpDie("l10n check failed with ".$errors." errors");
+}
+
+
+function phpDie($msg) {
+    echo $msg.PHP_EOL;
+    exit(1);
+}
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 54a02b4..7ee559d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,6 +26,8 @@ jobs:
         java-version: '8'
     - name: "Build jar"
       run: |
+        php $GITHUB_WORKSPACE/.github/scripts/check_l10n.php src/main/resources/l10n
+        [ $? -eq 0 ] || die "Missing translations"
         jar_file="build/ESP32PartitionTool.jar"
         . $GITHUB_WORKSPACE/.github/scripts/build_jar.sh $jar_file
         [ $? -eq 0 ] || die "Jar creation failed"
@@ -60,4 +62,4 @@ jobs:
         with:
           files: |
             /home/runner/work/esp32partitiontool/esp32partitiontool/archives/**
-          token: ${{ secrets.RELEASE_TOKEN }}  # Use the secret here
\ No newline at end of file
+          token: ${{ secrets.RELEASE_TOKEN }}  # Use the secret here