Translation files keep reseting

Hi,

I have a problem with the localization translations. I changed a few translations in the woocommerce-fr_FR.po and then uploaded the .po and .mo files where they were (wp-content/languages/plugins/) and it works but after some time (maybe 24 hours) the files reset and I end up with the old translation again.
I’ve tried to change them again about 3 times but it keeps happening…

Do you have any idea where that would come from?
Thank you very much for your help!
Matt

My website : cookiesbymatt.com

### WordPress Environment ###

Home URL: https://www.cookiesbymatt.com
Site URL: https://www.cookiesbymatt.com
WC Version: 2.5.2
Log Directory Writable: ?  /home/cookiesb/public_html/wp-content/uploads/wc-logs/
WP Version: 4.4.2
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
Language: fr_FR

### Server Environment ###

Server Info: Apache
PHP Version: 5.6.17
PHP Post Max Size: 128 MB
PHP Time Limit: 120
PHP Max Input Vars: 3000
SUHOSIN Installed: –
MySQL Version: 5.5.44
Max Upload Size: 128 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Remote Post: ?
Remote Get: ?

### Database ###

WC Database Version: 2.5.2
:
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_termmeta: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?

### Active Plugins (15) ###

Redux Framework: par Team Redux – 3.5.9
Contact Form 7: par Takayuki Miyoshi – 4.3.1
EWWW Image Optimizer: par Shane Bishop – 2.5.9
Force Regenerate Thumbnails: par Pedro Elsner – 2.0.5
Really Simple SSL: par Rogier Lankhorst – 2.2.16
Recent Facebook Posts: par Danny van Kooten – 2.0.8
Shortcodes Indep: par ThemesIndep – 3.5
Stripe WooCommerce Addon: par Syed Nazrul Hassan – 1.0.5
Video Thumbnails: par Sutherland Boswell – 2.12.1
WooCommerce Checkout Field Editor: par WooThemes – 1.4.10
WooCommerce: par WooThemes – 2.5.2
WooSidebars: par WooThemes – 1.4.3
WooThemes Helper: par WooThemes – 1.5.9
Yoast SEO: par L'équipe Yoast – 3.0.7
WP Rocket: par WP Rocket – 2.6.15

### Settings ###

Force SSL: –
Currency: EUR (€)
Currency Position: right_space
Thousand Separator: .
Decimal Separator: ,
Number of Decimals: 2

### API ###

API Enabled: ?
API Version: 3.1.0

### WC Pages ###

Base Boutique: #7 - /boutique/
Panier: #8 - /panier/
Commande: #9 - /commande/
Mon Compte: #10 - /mon-compte/

### Taxonomies ###

Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### Theme ###

Name: SimpleMag
Version: 4.1
Author URL: https://themesindep.com/
Child Theme: ? – Si vous modifiez WooCommerce sur un thème parent que vous n’avez pas construit personnellement
nous vous recommandons d’utiliser un thème enfant. Voir?: Comment créer un thème enfant

WooCommerce Support: ?

### Templates ###

Overrides: simplemag/woocommerce/archive-product.php
simplemag/woocommerce/cart/cart-totals.php
simplemag/woocommerce/cart/cart.php
simplemag/woocommerce/cart/cross-sells.php
simplemag/woocommerce/checkout/form-billing.php
simplemag/woocommerce/checkout/form-checkout.php
simplemag/woocommerce/checkout/review-order.php
simplemag/woocommerce/checkout/thankyou.php
simplemag/woocommerce/content-product.php
simplemag/woocommerce/content-product_cat.php version 2.5.0 est obsolète. La version du core est 2.5.2
simplemag/woocommerce/content-single-product.php
simplemag/woocommerce/loop/loop-end.php
simplemag/woocommerce/loop/loop-start.php
simplemag/woocommerce/loop/pagination.php
simplemag/woocommerce/single-product/add-to-cart/variable.php
simplemag/woocommerce/single-product/product-image.php
simplemag/woocommerce/single-product/product-thumbnails.php
simplemag/woocommerce/single-product/related.php
simplemag/woocommerce/single-product/up-sells.php
simplemag/woocommerce/single-product.php

: Apprendre comment actualiser les modèles remplacés