Tajik Translation Updated

Tajik Translation Updated
Merge pull request #361 from Ibragimov/master

Tajik Translation Updated
A little improvement in plain text converting for RTL languages
Refactor work with RTL languages in word search list and history list
Properly handle non-normalized unicode headwords

With that change users should be able to search headwords in
any form. For example:

U+03B5 GREEK SMALL LETTER EPSILON and U+0301 COMBINING ACUTE ACCENT

is considered equal to

U+03AD GREEK SMALL LETTER EPSILON WITH TONOS

And no matter in what form the headword is provided in the dictionary, users will be able to find it,
even using the different form.
RTL languages support for tab and main window header and article context menu
Refactor show dictionary info in "Groups" tab
DSL: Strip comments "{{...}}" when reading file
Update pt_BR.ts

Again, now translated by current github source code.
Merge pull request #367 from AlexandroCasanova/patch-2

Update pt_BR.ts
README: Use qmake-qt4 instead of qmake
Enhanced support for RTL languages in articles
Added an alternative GoldenDict icon, under GPLv2+. The icon is not yet used.

The plan is to use it at least in Ubuntu, it looks nice there.

See #183.
Move Android's icon.svg to icons folder
README: Add missing dependencies

Git and libqtwebkit-dev are listed now explicitly.
Linux: Use better and bigger (256x256) icon for GoldenDict.desktop file

The end result on Ubunutu looks MUCH, MUCH better compared to the
ugly 24x24 icon we had previously.
Additional detection for text direction in plain text articles
Some more support for RTL languages in articles
Update belarusian translation