TwentyEleven i18n Improvements

[dimadin]

Categories and tags lists shown in archives are not i18n friendly since they don't use placeholder and instead are broken to use the_category() and the_tags() function.

My fix is based on one from TwentyTen with addition of checks for | separator between lists and i18n of separator between lists items since we already have one in wp_sprintf_l().

Note to Automatticans (since they are original authors): I see that in your themes you have this hacks that work for English, so please always use placeholders and assume that in some language word order is different.

[ocean90]

​s/coma/comma/ ;)

[iandstewart]

In [18029]:

Twenty Eleven: make categories and tags i18n friendly; Props dimadin; Fixes #17531