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WIP: Week 1 English cleanup

This is similar to the editing I did for Programming Basics Part 1. According
to the contributor guidelines, you would like to know about work being done.

I am looking to enforce existing HTML usage, and rewrite some slightly awkward
phrasing into hopefully more idiomatic English. I try and correct spelling and
grammer mistakes where I find them.
Merge pull request #36 from mateor/sp

WIP: Week 1 English cleanup
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Merge branch 'master' of github.com:UniversityHelsinkiTKTL/MOOC-material
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Merge branch 'master' of github.com:UniversityHelsinkiTKTL/MOOC-material
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Fixed various typos and translations
various translation fixes
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Merge branch 'master' of github.com:UniversityHelsinkiTKTL/MOOC-material
added some of the required images for wk5
imgs
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Exercise 41 done
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