removed i18ned placeholder for academic year format with hardwired value. no need to translate this.
added translatable term "Timing".
updated duration related entries.
swapped out translation key.
added new entries, re-sorted existing ones.
changed name of expected form post parameter for consistency reasons.
added new entries.
fleshed out markup for create new sequence block dialog.
shortened label text and capitalized label texts for consistency reasons across the targetted dialog.
changed label text from plural to singular form.