Extracted the Dune 2000 mission strings

[Mailaender]

for translation.

[abcdefg30]

Seems like we need to incorporate some things from the other PRs to be consistent (translation parameters for the times and enemy objectives being unnamed). Also made some spelling suggestions while we're at it.

[penev92]

I was skimming through the Lua changes and was thinking why not have a bunch of variables at the top of the script (or one table) that have all the translations and are used throughout the script instead of calling UserInterface.Translate() everywhere. Then I saw there is a Messages table at the top of at least one script. So I have to ask - is there a reason not all translations are done like that?

[PunkPun]

Having all translations at the top would perhaps make lint tests work on missions?

[penev92]

There was no response to the above questions 🙁 but I do think we should do it (in a follow-up PR is fine).

[Mailaender]

This pull request has the scope as defined in the title. Please create a new ticket for linting Lua translatable strings. Linting this is far from easy and you don't want this cramped in here.

[abcdefg30]

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