feat(back-end front-end): shop improvements

backend/src/test/java/com/printcalculator/entity/FilamentVariantTest.java

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+package com.printcalculator.entity;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class FilamentVariantTest {
+
+    @Test
+    void getColorLabelForLanguageShouldReturnLocalizedValue() {
+        FilamentVariant variant = new FilamentVariant();
+        variant.setColorName("Orange");
+        variant.setColorLabelIt("Arancione");
+        variant.setColorLabelEn("Orange");
+        variant.setColorLabelDe("Orange");
+        variant.setColorLabelFr("Orange");
+
+        assertEquals("Arancione", variant.getColorLabelForLanguage("it"));
+        assertEquals("Orange", variant.getColorLabelForLanguage("en"));
+        assertEquals("Orange", variant.getColorLabelForLanguage("de-CH"));
+    }
+
+    @Test
+    void getColorLabelForLanguageShouldFallbackToColorName() {
+        FilamentVariant variant = new FilamentVariant();
+        variant.setColorName("Orange");
+
+        assertEquals("Orange", variant.getColorLabelForLanguage("it"));
+        assertEquals("Orange", variant.getColorLabelForLanguage("fr"));
+    }
+}

backend/src/test/java/com/printcalculator/entity/ShopProductVariantTest.java

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+package com.printcalculator.entity;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class ShopProductVariantTest {
+
+    @Test
+    void getColorLabelForLanguageShouldReturnLocalizedValue() {
+        ShopProductVariant variant = new ShopProductVariant();
+        variant.setColorName("Gray");
+        variant.setColorLabelIt("Grigio");
+        variant.setColorLabelEn("Gray");
+        variant.setColorLabelDe("Grau");
+        variant.setColorLabelFr("Gris");
+
+        assertEquals("Grigio", variant.getColorLabelForLanguage("it"));
+        assertEquals("Gray", variant.getColorLabelForLanguage("en"));
+        assertEquals("Grau", variant.getColorLabelForLanguage("de"));
+        assertEquals("Gris", variant.getColorLabelForLanguage("fr-CH"));
+    }
+
+    @Test
+    void getColorLabelForLanguageShouldFallbackToColorName() {
+        ShopProductVariant variant = new ShopProductVariant();
+        variant.setColorName("Gray");
+
+        assertEquals("Gray", variant.getColorLabelForLanguage("it"));
+        assertEquals("Gray", variant.getColorLabelForLanguage("de"));
+    }
+}