Take our apologies for the delay in answering. WordPress 5.5 update caused a lot of issues with many bundled plugins and themes. We have so many requests from users that response time is increased more than we would like.
Before update the WP to version 5.5, make sure that all the third-party plugins that you use support the latest update of WP. In other case you may have issues. For example, Massive Addons plugin has not released a new update compatible with the WP 5.5 yet.
1), 3) We have updated theme to the latest version for you. Synced the translations and I don’t see the problem with it. Use the Lightshot screenshot tool to make screenshot and share it with us. Provide screenshot of strings that missing translation.
2) You hide the titles of the second level of your menu http://prntscr.com/tz2scz So, what do you expect to get for the mobile? Titles are hidden. In your case, I would recommend you to create a separate menu only for the mobile and don’t hide titles in that menu http://prntscr.com/tz2tcc
Glad to hear that our update fixed the issues.
You placed the multiple translation files to incorrect folders and that’s why they do not work as should and conflict. Theme translation should be in wp-content/languages/themes/legenda-fr_FR and Legenda core plugin translation should be in wp-content/languages/plugins/legenda-core-fr_FR
I found that you left the 1-star rating https://themeforest.net/ratings/3180679
Would you be so kind to change it? We do really want to help all our client as fast as possible but our resources are limited because of the vacations and WP update boosted the amount of the request significantly.