The string "x has been added to your Wish List. Click here to continue shopping." can be found in the template Magento/Wishlist/view/frontend/templates/messages/addProductSuccessMessage.phtml
But it doesn't the usual pattern
<?php /* @escapeNotVerified */ echo __('Some string you can translate') ?>
What should I write in my csv file?
Below the template file
<?php
echo $block
->escapeHtml(
$block->getData('product_name')
)
?> has been added to your Wish List. Click <a href="<?php
echo $block
->escapeUrl(
$block->getData('referer')
)
?>">here</a> to continue shopping.
edit 02.09.2019
Since the question was asked, the template file has been updated to be translatable https://github.com/magento/magento2/commit/624173e59cdbb5f4203ce346b1b53637f32672ef#diff-7586a821ac9c752c277b0c4304885b76
Best Answer
Usually you would use sprintf to pass in the dynamic details then you can use the formatting string to do translation.
Example:
$message = sprintf("%s has been added to your cart.", $product->getName());
Then in your csv you would just include:
%s has been added to your cart.
And then translate to whatever language you require, keeping the %s.