remove theming from account attributes table
add name to theming
fix attribute translations
replace theming migrations

create themings for each account instead of renaming the themes table
to themings. Otherwise accounts share a theming after migration which
is not the desired final state.
update theming migrations in dummy up
add 'updating pageflow' wiki link to README
update CHANGELOG
Improve heading structure of CHANGELOG
Merge pull request #36 from schoetty/internationalization

fix attribute and value translations
Merge pull request #27 from schoetty/theming

remove theming from account attributes table
Update CHANGELOG.md
Removes obsolete 'global'-flag from default Theming.

The database seeds tried to set the removed field 'global' when creating a default theming.
Fixes broken labels in file explorer and manage files view.

Adds a new sass mixin "label" and uses it for single line fixed-width labels.
Makes files and entries in Files Explorer scrollable via overflow: auto.

File explorer is always full height. Some changes in html and css to make sure the height of the containing div is correct.
do not create new nested theming when updating account (#38)

update theme in account's default_theming instead.
Merge pull request #39 from tf/tf-nested-theming

Do not create new nested theming when updating account (#38)
Merge pull request #37 from kioopi/file_explorer_fixes

Fixes for the "Wiederverwenden" File Explorer