diff --git a/docker/webapp.Dockerfile b/docker/webapp.Dockerfile
index 81748e0..5c3f98f 100644
--- a/docker/webapp.Dockerfile
+++ b/docker/webapp.Dockerfile
@@ -15,6 +15,9 @@ COPY branding/constants/ constants/
 COPY branding/locales/ locales/
 COPY branding/assets/styles/imports/ assets/styles/imports/
 
+## Something like (bash, jq must be installed)
+# for locale in `ls locales/*.json`; do  jq -s '.[0] * .[1]' source/$locale $locale; done;
+
 ##################################################################################
 # BUILD ##########################################################################
 ##################################################################################
diff --git a/tools/test/file1.json b/tools/test/file1.json
new file mode 100644
index 0000000..19ec4e1
--- /dev/null
+++ b/tools/test/file1.json
@@ -0,0 +1,12 @@
+{
+  "a-key": "A",
+  "b-key": {
+    "a-subkey": "A",
+    "b-subkey": "B",
+    "c-subkey": {
+      "a-subsubkey": "A",
+      "b-subsubkey": "B"
+    }
+  },
+  "c-key": "C"
+}
diff --git a/tools/test/file2.json b/tools/test/file2.json
new file mode 100644
index 0000000..e4d7ade
--- /dev/null
+++ b/tools/test/file2.json
@@ -0,0 +1,11 @@
+{
+  "a-key": "AA",
+  "b-key": {
+    "b-subkey": "BB",
+    "c-subkey": {
+      "b-subsubkey": "BB",
+      "c-subsubkey": "C"
+    }
+  },
+  "d-key": "D"
+}
diff --git a/tools/test/result.json b/tools/test/result.json
new file mode 100644
index 0000000..843c235
--- /dev/null
+++ b/tools/test/result.json
@@ -0,0 +1,15 @@
+{
+  "a-key": "AA",
+  "b-key": {
+    "a-subkey": "A",
+    "b-subkey": "BB",
+    "c-subkey": {
+      "a-subsubkey": "A",
+      "b-subsubkey": "BB",
+      "c-subsubkey": "C"
+    }
+  },
+  "c-key": "C",
+  "d-key": "D"
+}
+