feat(back-end): new stock db and back-office improvements

frontend/src/assets/i18n/en.json

@@ -133,8 +133,6 @@
     "TITLE": "About Us",
     "EYEBROW": "3D Printing Lab",
     "SUBTITLE": "We are two students with a strong desire to build and learn.",
-    "HOW_TEXT": "3D Fab was born from Matteo's initial interest in 3D printing. He bought a printer and started experimenting seriously. \n At a certain point, the first requests arrived: a broken part to replace, a spare part that cannot be found, a handy adapter to have. The requests increased and we said: okay, let's do it properly.\nLater we created a calculator to understand the cost in advance: it was one of the first steps that took us from \"let's make a few parts\" to a real project, together.",
-    "PASSIONS_TITLE": "Our passions",
     "PASSION_BIKE_TRIAL": "Bike trial",
     "PASSION_MOUNTAIN": "Mountain",
     "PASSION_SKI": "Ski",