Author: Jun Pataleta
MDL-67683 output: Make block regions unique
Unique labels for the block regions:
* `side-pre` blocks - "Blocks"
* `side-post` blocks - "Supplementary blocks"
* `content` blocks - "Main content blocks"
Blocks in the main content region (div role="main") should not also be
in an <aside> as it is a top-level landmark.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bcbc1e4ccc8b3b3c88e28b1a54e49fd4c833ba1c
http://github.com/moodle/moodle/commit/bcbc1e4ccc8b3b3c88e28b1a54e49fd4c833ba1c
+ 4.4 en [blocks_main,core]
+ 4.4 en [blocks_supplementary,core]