Translation issue on checkout (with ajax?)

Woocommerce checkout page offers users to login, with the following introduction message: “If you have shopped with us before, please enter your details in the boxes below. If you are a new customer please proceed to the Billing & Shipping section.”

NB: to see it on my site, choose a variable product here, and, from the cart, proceed to checkout, then click on “Déjà client ? Cliquez ici pour vous connecter”.

I found the string that corresponds to this message in woocommerce .po file (in /wp-content/languages/woocommerce/woocommerce-fr_FR.po), and I translated it through poedit, but the translation does nos show. (Others do, so I think my translation setup is OK…)

I suspect it may be because ajax is involved in the checkout page, (the message and the form show only if user ticks a checkbox), because others had similar translating issues with ajax in the backend (WooCommerce: Translation lost on AJAX call in Checkout page), but I d”ont know how to adjust.

Else, I found this all happens in woocommerce/templates/global/form-login.php and that must be inside but I don’t know how to go further.

Any help appreciated !

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### WordPress Environment ###

Home URL: http://mathez-dev-mathezcf.pf2.wpserveur.net
Site URL: http://mathez-dev-mathezcf.pf2.wpserveur.net
WC Version: 2.6.2
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WP Cron: ✔
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### Server Environment ###

Server Info: nginx/1.10.1
PHP Version: 5.6.23-0+deb8u1
PHP Post Max Size: 100 MB
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PHP Max Input Vars: 1000
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### Database ###

WC Database Version: 2.6.2
:
woocommerce_sessions: ✔
woocommerce_api_keys: ✔
woocommerce_attribute_taxonomies: ✔
woocommerce_downloadable_product_permissions: ✔
woocommerce_order_items: ✔
woocommerce_order_itemmeta: ✔
woocommerce_tax_rates: ✔
woocommerce_tax_rate_locations: ✔
woocommerce_shipping_zones: ✔
woocommerce_shipping_zone_locations: ✔
woocommerce_shipping_zone_methods: ✔
woocommerce_payment_tokens: ✔
woocommerce_payment_tokenmeta: ✔
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Admin Menu Editor: par Janis Elsts – 1.6.2
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### Templates ###

Overrides: masterstudy-mcf/woocommerce/archive-product.php
masterstudy-mcf/woocommerce/cart/cart-empty.php
masterstudy-parent/woocommerce/cart/cart-item-data.php
masterstudy-parent/woocommerce/cart/cart-shipping.php
masterstudy-parent/woocommerce/cart/cart-totals.php
masterstudy-mcf/woocommerce/cart/cart.php
masterstudy-parent/woocommerce/cart/cross-sells.php
masterstudy-parent/woocommerce/cart/mini-cart.php
masterstudy-parent/woocommerce/cart/shipping-calculator.php
masterstudy-parent/woocommerce/checkout/cart-errors.php
masterstudy-parent/woocommerce/checkout/form-billing.php
masterstudy-parent/woocommerce/checkout/form-checkout.php
masterstudy-parent/woocommerce/checkout/form-coupon.php
masterstudy-parent/woocommerce/checkout/form-login.php
masterstudy-parent/woocommerce/checkout/form-pay.php
masterstudy-parent/woocommerce/checkout/form-shipping.php
masterstudy-parent/woocommerce/checkout/payment-method.php
masterstudy-parent/woocommerce/checkout/payment.php
masterstudy-parent/woocommerce/checkout/review-order.php
masterstudy-parent/woocommerce/checkout/thankyou.php
masterstudy-mcf/woocommerce/content-product.php
masterstudy-parent/woocommerce/content-product_cat.php
masterstudy-mcf/woocommerce/content-single-product.php
masterstudy-parent/woocommerce/global/breadcrumb.php
masterstudy-parent/woocommerce/global/form-login.php
masterstudy-parent/woocommerce/global/quantity-input.php
masterstudy-parent/woocommerce/global/sidebar.php
masterstudy-parent/woocommerce/global/wrapper-end.php
masterstudy-parent/woocommerce/global/wrapper-start.php
masterstudy-parent/woocommerce/loop/add-to-cart.php
masterstudy-parent/woocommerce/loop/loop-end.php
masterstudy-parent/woocommerce/loop/loop-start.php
masterstudy-parent/woocommerce/loop/no-products-found.php
masterstudy-parent/woocommerce/loop/orderby.php
masterstudy-parent/woocommerce/loop/pagination.php
masterstudy-parent/woocommerce/loop/price.php
masterstudy-parent/woocommerce/loop/rating.php
masterstudy-parent/woocommerce/loop/result-count.php
masterstudy-parent/woocommerce/loop/sale-flash.php
masterstudy-parent/woocommerce/myaccount/form-login.php
masterstudy-parent/woocommerce/myaccount/form-lost-password.php
masterstudy-parent/woocommerce/myaccount/my-address.php
masterstudy-parent/woocommerce/myaccount/my-downloads.php
masterstudy-parent/woocommerce/myaccount/my-orders.php
masterstudy-parent/woocommerce/notices/error.php
masterstudy-mcf/woocommerce/notices/notice.php
masterstudy-parent/woocommerce/notices/success.php
masterstudy-parent/woocommerce/order/form-tracking.php
masterstudy-parent/woocommerce/order/order-again.php
masterstudy-parent/woocommerce/order/tracking.php
masterstudy-mcf/woocommerce/product-searchform.php
masterstudy-parent/woocommerce/single-product/add-to-cart/external.php
masterstudy-parent/woocommerce/single-product/add-to-cart/grouped.php
masterstudy-parent/woocommerce/single-product/add-to-cart/simple.php
masterstudy-parent/woocommerce/single-product/add-to-cart/variable.php
masterstudy-parent/woocommerce/single-product/meta.php
masterstudy-mcf/woocommerce/single-product/price.php
masterstudy-parent/woocommerce/single-product/product-attributes.php
masterstudy-parent/woocommerce/single-product/product-image.php
masterstudy-parent/woocommerce/single-product/product-thumbnails.php
masterstudy-mcf/woocommerce/single-product/rating.php
masterstudy-parent/woocommerce/single-product/related.php
masterstudy-parent/woocommerce/single-product/review.php
masterstudy-parent/woocommerce/single-product/sale-flash.php
masterstudy-parent/woocommerce/single-product/share.php
masterstudy-parent/woocommerce/single-product/short-description.php
masterstudy-parent/woocommerce/single-product/tabs/additional-information.php
masterstudy-parent/woocommerce/single-product/tabs/description.php
masterstudy-parent/woocommerce/single-product/tabs/tabs.php
masterstudy-mcf/woocommerce/single-product/title.php
masterstudy-parent/woocommerce/single-product/up-sells.php
masterstudy-mcf/woocommerce/single-product-reviews.php
masterstudy-parent/woocommerce/single-product.php
masterstudy-parent/woocommerce/taxonomy-product_cat.php
masterstudy-parent/woocommerce/taxonomy-product_tag.php

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https://wordpress.org/plugins/woocommerce/