Bettering error description readability

Reordering descriptions of error levels to be consistent with how they are listed above.
Merge pull request #461 from jlaswell/patch-1

Bettering error description readability
renaming bytecode to opcode
#462
typos
Merge pull request #463 from maglnet/rename-bytecode-to-opcode

renaming bytecode to opcode
Update 11-03-01-Behavior-Driven-Development.md

remove www.* from broken Codeception link
Merge pull request #468 from mvargeson/bugfix/codeception-broken-link

Update 11-03-01-Behavior-Driven-Development.md
Used .html as filename extension for templates

In user_profile we're actually extending template.html and not
template.php
Merge pull request #470 from michael-k/fn-ext

Used .html as filename extension for templates
Update translation