Fix typos and change wording in Dashboard 2.0 system messages

[maarcingebala]

There is a bunch of typos in Dashboard 2.0 messages to fix:

• "Use variants for products that come in a variety of version for example different sizes or colors" -> should be "[...] in a variety of versions [...]"
• Home page: “Here are some information…” -> "Here is some information..."
• "Catalogue" -> should be "Catalog" (we use American English)
• On the vouchers page: "General informations" / "Detailed informations" -> should be “information” in both cases

Another issue is that we're using past perfect tense in the system messages like:
"Order #XYZ had been placed"
"Order #XYZ had been fully paid"

These all should be rewritten to Past Simple version:
"Order #XYZ was placed"
"Order #XYZ was fully paid"

There are many more examples like the above, e.g. in the OrderHistory.tsx file.