Restore icons on buttons

With the switch to lesscpy, the icons were not being displayed on
buttons anymore. Avoiding nested Mixin definitions appears to resolve
the issue.

Change-Id: I09699fb37f55b989893905f3b8978a17e317f598
Closes-Bug: #1226580
Fixes incomplete translation support of "Defaults" table

Inside of administration section, some rows of default quotas table
(e.g. Volumes, Metadata Items, Instances, etc.) were coded using its
name instead of a locale value for its translation.

Change-Id: Iccd163f9a9f35358bf9213491301b070368aff04
Closes-Bug: #1224824
Make troveclient optional

Fixes bug 1221906

Change-Id: I3d022fca2f6bc1f0f5143373259882f2522f7958
Regenerate POT (English PO) files

If POT files contains translated messages, Transifex seems to use
msgstr rather than msgid as index, and this leads to incorrect
source language strings in Transifex [1].
POT files should not have any strings in msgstr to avoid this problem.

This commit regenerates POT files from scratch.

[1] http://lists.openstack.org/pipermail/openstack-i18n/2013-September/000103.html

Closes-Bug: #1226428
Change-Id: I9aa11323edbfd98b95bbc2c26be337cc77df5e87
Merge "Regenerate POT (English PO) files"
Merge "Make troveclient optional"
Merge "Restore icons on buttons"
Enable two verbose_names in AttachmentsTable translatable

One is the table name "Attachments".
The other is the column name "Device".

Closes-Bug: #1226966
Change-Id: I323fcf1dbae50c4b29912be2e308d97320ed3768
Merge "Fixes incomplete translation support of "Defaults" table"
Merge "Enable two verbose_names in AttachmentsTable translatable"
Update English PO files (source lang of translations)

Change-Id: I65c15e9aed44783416a4303e914aa47c7a7c0b37