Fixed typos in original language files

Adjusted casing for several strings.
Made the use of "synchronisation" vs. "synchronization" consistent,
always using "synchroisation" now.
Merge branch 'srodeme-master'
Merge branch 'translation-fixes' of https://github.com/srodeme/digital-ocean-swimmer into srodeme-translation-fixes
Merge branch 'srodeme-translation-fixes'