Update README: s/,/;/ s/every/all/ s/notably //

[annag42]

Three minor changes:

1. Changed a comma between two independent clauses to a semicolon.
2. Changed "every translations" to "all translations", to match the (plural) number used through the rest of the sentence.
3. Removed the word "notably " from "because notably they don't contain", as a. it was unnecessary (superfluous, extra), and b. no other reasons were given, thus the reason given was the reason, not just notable as one among the reasons.

Thanks, annag