first upload all files

Modules/Coupon/Resources/lang/en/attributes.php

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+<?php
+
+return [
+    'name' => 'Name',
+    'code' => 'Code',
+    'is_percent' => 'Discount Type',
+    'value' => 'Value',
+    'free_shipping' => 'Free Shipping',
+    'start_date' => 'Start date',
+    'end_date' => 'End date',
+    'is_active' => 'Status',
+    'minimum_spend' => 'Minimum Spend',
+    'maximum_spend' => 'Maximum Spend',
+    'products' => 'Products',
+    'exclude_products' => 'Exclude Products',
+    'categories' => 'Categories',
+    'exclude_categories' => 'Exclude Categories',
+    'usage_limit_per_coupon' => 'Usage Limit Per Coupon',
+    'usage_limit_per_customer' => 'Usage Limit Per Customer',
+];

Modules/Coupon/Resources/lang/en/coupons.php

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+<?php
+
+return [
+    'coupon' => 'Coupon',
+    'coupons' => 'Coupons',
+    'table' => [
+        'name' => 'Name',
+        'code' => 'Code',
+        'discount' => 'Discount',
+    ],
+    'tabs' => [
+        'group' => [
+            'coupon_information' => 'Coupon Information',
+        ],
+        'general' => 'General',
+        'usage_restrictions' => 'Usage Restrictions',
+        'usage_limits' => 'Usage Limits',
+    ],
+    'form' => [
+        'price_types' => [
+            '0' => 'Fixed',
+            '1' => 'Percent',
+        ],
+        'allow_free_shipping' => 'Allow free shipping',
+        'enable_the_coupon' => 'Enable the coupon',
+    ],
+];

Modules/Coupon/Resources/lang/en/messages.php

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+<?php
+
+return [
+    'not_exists' => 'The coupon does not exist.',
+    'already_applied' => 'The coupon has been already applied.',
+    'invalid_coupon' => 'The coupon is not valid.',
+    'minimum_spend' => 'You need to spend at least :amount to apply this coupon.',
+    'maximum_spend' => 'You need to spend less than :amount to apply this coupon.',
+    'inapplicable' => 'This coupon is not applicable to your cart.',
+    'usage_limit_reached' => 'The coupon usage limit has been reached.',
+];

Modules/Coupon/Resources/lang/en/permissions.php

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+<?php
+
+return [
+    'index' => 'Index Coupons',
+    'create' => 'Create Coupons',
+    'edit' => 'Edit Coupons',
+    'destroy' => 'Delete Coupons',
+];