There is a strange behavior with Jira Charting plugin. My Jira instance is set to English language but I'm using a French-language browser. Some reports pre-rendered by this plugin are listed in French and some in English on my UI (those in French are coming from Charting plugin, none of them were in French before plugin installation). Here is what I can read from reports listing when browsing in a project:
Demandes Soumises Récemment (instead of Recently Created Issues Report)
Demandes Soumises vs Résolues (instead of Created vs Resolved Issues Report)
Temps de Résolution (instead of Resolution Time Report)
Average Age Report
Pie Chart Report
...