diff --git a/src/locales/en.json b/src/locales/en.json
index f36984e..23e7557 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -175,13 +175,13 @@
       "vehicles-wagon": "wagons"
     },
     "sort-by": {
-      "type": "Name",
-      "group": "Type group",
-      "length": "Length",
-      "weight": "Mass",
-      "maxSpeed": "Speed",
-      "coldStart": "Cold start",
-      "cargoCount": "Cargo count"
+      "type": "name",
+      "group": "type group",
+      "length": "length",
+      "weight": "mass",
+      "maxSpeed": "speed",
+      "coldStart": "cold start",
+      "cargoCount": "cargo count"
     },
     "sort-direction": {
       "asc": "ascending",
diff --git a/src/locales/pl.json b/src/locales/pl.json
index d4ab654..8ffdf5c 100644
--- a/src/locales/pl.json
+++ b/src/locales/pl.json
@@ -175,13 +175,13 @@
       "vehicles-wagon": "wagony"
     },
     "sort-by": {
-      "type": "Nazwa",
-      "group": "Rodzaj",
-      "length": "Długość",
-      "weight": "Masa",
-      "maxSpeed": "Prędkość",
-      "coldStart": "Zimny start",
-      "cargoCount": "Ładunki"
+      "type": "nazwa",
+      "group": "rodzaj",
+      "length": "długość",
+      "weight": "masa",
+      "maxSpeed": "prędkość",
+      "coldStart": "zimny start",
+      "cargoCount": "ładunki"
     },
     "sort-direction": {
       "asc": "rosnąco",