New translations browser.ftl (French)

[skip ci]

Author: filips123

native/userchrome/profile/chrome/pwa/localization/fr/pwa/browser.ftl

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+## Toolbars should be translated in the same style and capitalization as existing Firefox messages in your language
+## Example: https://pontoon.mozilla.org/sl/firefox/browser/browser/toolbarContextMenu.ftl/?string=231726
+## Example: https://pontoon.mozilla.org/sl/firefox/browser/browser/browser.ftl/?string=217992
+
+
+## Popup inputs should be translated in imperative mood, without any end punctuation
+