I downloaded zen-cart-v1.5.6a-01042019.zip and try to translate for updating.
It seems that the file has duplicate definitions.
\zen-cart-v1.5.6a-01042019\admin\includes\languages\english\attributes_controller.php
line 89-95
define('TEXT_ATTRIBUTES_FLAGS','Attribute Flags:');
define('TEXT_ATTRIBUTES_DISPLAY_ONLY', 'Used For<br />Display Purposes Only:');
define('TEXT_ATTRIBUTES_IS_FREE', 'Attribute is Free<br />When Product is Free:');
define('TEXT_ATTRIBUTES_DEFAULT', 'Default Attribute<br />to be Marked Selected:');
define('TEXT_ATTRIBUTE_IS_DISCOUNTED', 'Apply Discounts Used<br />by Product Special/Sale:');
define('TEXT_ATTRIBUTE_PRICE_BASE_INCLUDED','Include in Base Price<br />When Priced by Attributes');
define('TEXT_ATTRIBUTES_REQUIRED','Attribute Required<br />for Text:');
line 178-184
define('TEXT_ATTRIBUTES_FLAGS', 'Attribute Flags:');
define('TEXT_ATTRIBUTES_DISPLAY_ONLY', 'Used For Display Purposes Only:');
define('TEXT_ATTRIBUTES_IS_FREE', 'Attribute is Free When Product is Free:');
define('TEXT_ATTRIBUTES_DEFAULT', 'Default Attribute to be Marked Selected:');
define('TEXT_ATTRIBUTE_IS_DISCOUNTED', 'Apply Discounts Used by Product Special/Sale:');
define('TEXT_ATTRIBUTE_PRICE_BASE_INCLUDED', 'Include in Base Price When Priced by Attributes');
define('TEXT_ATTRIBUTES_REQUIRED', 'Attribute Required for Text:');
Bookmarks