html: test for all translation states and outcomes

Just to verify that we're doing the right thing when using untranslated,
translated and fuzzy (also with includefuzzy) strings.
accesskeys: space also signifies that we're not in an entity

We where failing with "& Something" as we never indicated that we where
not in an entity when we hit the 'space'.
fn tests: fix comment
fn tests: test simple poswap