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Most of the UI was lacking tooltips for accessibility.
This patch is a roundup of all the fields, buttons, and selectors,
for setting up a first stone to build upon.

Change-Id: I63f5e9aa1c5e96c61fd04540df50895579bb293d
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>

Also remove some strings that should not be translated or
that were not displayed

Change-Id: Ia973e6ea06f349b1b3db20b4664d29c7510c4bbe

- changes the generic QPushButtons used to open a file/folder chooser dialog
for a new kind called RingButton.

- icons are always at the right most position of the button.

- removes some cssblob in stylesheet.

Change-Id: Ie1c3832f6496e0e7de4bb7d120e7081483ec8785
Tuleap: #482