Tested on a current Nightly in Italian, and the button at the top are displayed in English. The FTL file should be added here to include it in builds: https://searchfox.org/mozilla-central/source/mobile/android/locales/jar.mn#35-55
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Tested on a current Nightly in Italian, and the button at the top are displayed in English. The FTL file `toolkit/pdfviewer/viewer.ftl` should be added here to include it in builds: https://searchfox.org/mozilla-central/source/mobile/android/locales/jar.mn#35-55