first upload all files

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

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+<?php
+
+return [
+    'left_in_stock' => ':count left in stock',
+    'in_stock' => 'In stock',
+    'out_of_stock' => 'Out of stock',
+    'wishlist' => 'Wishlist',
+    'compare' => 'Compare',
+    'options' => [
+        'choose_an_option' => 'Choose an option',
+    ],
+    'quantity' => 'Quantity',
+    'add_to_cart' => 'ADD TO CART',
+    'sku' => 'SKU:',
+    'categories' => 'Categories:',
+    'tags' => 'Tags:',
+    'share' => 'Share:',
+    'facebook' => 'Facebook',
+    'twitter' => 'Twitter',
+    'linkedin' => 'Linkedin',
+    'tumblr' => 'Tumblr',
+    'you_might_also_like' => 'You might also like',
+    'description' => 'Description',
+    'specification' => 'Specification',
+    'reviews' => 'Reviews (:count)',
+    'add_a_review' => 'Add a review',
+    'review_form' => [
+        'your_rating' => 'Your Rating',
+        'name' => 'Name',
+        'comment' => 'Comment',
+        'submit' => 'SUBMIT',
+    ],
+    'be_the_first_one_to_review_this_product' => 'Be the first one to review this product.',
+    'related_products' => 'Related Products',
+];