apps: add download links on login page

* Add Badges with official links to store pages on login page
* Add AppStore/Google Play badges in static img assets [1][2]
* Add translation for "Download on the AppStore" and "Get it on Google Play"

[1] https://developer.apple.com/app-store/marketing/guidelines/
[2] https://partnermarketinghub.withgoogle.com/brands/google-play/visual-identity/badge-guidelines/

Signed-off-by: Alexis Mercier des Rochettes <apernouille@gmail.com>

note_kfet/static/img/playstore_badge_fr.svg

@@ -0,0 +1,49 @@
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