But then I can't rename it to my native language, otherwise when someone browses my site in English they'll see the word I've renamed.

Hello.
Here is the patch to fix the Sale text

Thank you for the kind words, glad to hear you’re enjoying AbanteCart’s front end! We appreciate your feedback and are happy to know the upgrade to 1.4.2 went smoothly.

In the meantime, while your hosting support looks into resolving the issue with WebP image handling, feel free to safely use standard image formats like JPG or PNG. These formats are fully supported and should work without any issues as you continue adding content.

Hello.
The image error you’re seeing is most likely related to the PHP GD library on your server. Specifically, older versions of GD don’t support WebP format, which can trigger those types of errors even if you’re not directly uploading WebP images yourself—AbanteCart or the browser might be trying to serve them automatically if supported.
The good news is that this is usually an easy fix. I recommend contacting your hosting provider and asking them to make sure the server has an up-to-date version of PHP with full GD and WebP support enabled.

When you say the database was “corrupt,” could you clarify what exactly made you think that? Were there specific errors or behaviors? Often, a proper backup restore should resolve most issues unless the backup itself was incomplete or taken while the database was in an unstable state. If you have any logs or symptoms you noticed before the crash, it might help narrow down the root cause.

Hello.
Based on your description, it does sound like a Web Application Firewall (WAF) configuration issue. Most often, it is related to ModSecurity or similar server-side security rules.
Temporarily disable ModSecurity again, and this time wait at least 1 hour before testing the admin settings area.
If the issue still persists after that, it’s best to reach out to your hosting provider’s support team.

Do you have any alternative solution for this. If any one have then please suggest.
Thanks

Have you tried using the Import Wizard format? It might help simplify the process
https://abantecart.atlassian.net/wiki/spaces/AD/pages/16777227/Import+Wizard#Products-import-example

Hello.
Please review the slider block in the Admin panel
https://abantecart.atlassian.net/wiki/spaces/AD/pages/12582976/Banner+Slider#Novator-theme-sliders
There, you’ll see the current image paths. You can also upload new images using the Add Media button.

I have made a clean install and tried to rename SALE in the english language and it doesnt work, still continues with word SALE

Hello. Please provide a screenshot

Thank you,  I had made a significant contribution, however I never received any type of receipt, which is beneficial for my business tracking. If and when receipts are automatically sent to contributors after they contribute,  I will again contribute. Having said that I appreciate all your work and for all of those in the open source world.

Thank you very much for your contribution and your kind words of support. We truly appreciate your involvement and recognition of the work put into the AbanteCart project and the broader open-source community.