ODF standard handle 'textarea-vertical-align' as a
'graphic-property' which "specifies formatting
properties for chart, draw, graphic, and frame elements".
So this change fit to the standard.
Change-Id: I956f512953380983c2c882e943178335fd4dbfeb
This prepares to be able to read/write the attributes, it does not
enable proper handling of unknown language tags yet. An unknown tag
usually falls back to SYSTEM locale.
Change-Id: I4a78e8fd37deae188c69570157bc4589a712bc7a
see https://gerrit.libreoffice.org/#/c/3367/
and Change-Id: I00c96fa77d04b33a6f8c8cd3490dfcd9bdc9e84a for details
Change-Id: I199a75bc4042af20817265d5ef85b1134a96ff5a