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Themes/Storefront/resources/lang/en/compare.php

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+<?php
+
+return [
+    'compare' => 'Compare',
+    'no_product' => 'No product in the compare list.',
+    'product_overview' => 'Product Overview',
+    'description' => 'Description',
+    'rating' => 'Rating',
+    'availability' => 'Availability',
+    'in_stock' => 'In Stock',
+    'out_of_stock' => 'Out of Stock',
+    'price' => 'Price',
+    'actions' => 'Actions',
+    'add_to_cart' => 'Add to cart',
+];