Updated Russian translation

[lufog]

The translation contains some necessary strings that are not present in the source code. For example, translation for standard buttons:

<context>
    <name>QPlatformTheme</name>
    <message>
        <source>Cancel</source>
        <translation>Отмена</translation>
    </message>
    <message>
        <source>Apply</source>
        <translation>Применить</translation>
    </message>
    <message>
        <source>OK</source>
        <translation>ОК</translation>
    </message>
    <message>
        <source>&amp;Yes</source>
        <translation>&amp;Да</translation>
    </message>
    <message>
        <source>&amp;No</source>
        <translation>&amp;Нет</translation>
    </message>
</context>

The problem is that after lupdate they are marked with type = "vanished", so they are not included in the resulting qm file. Are there any ways how to fix this? Maybe add some code to the source or mark these lines in some way?

[lufog]

@DavidXanatos I have some problem with translation, I described it, in pull request description. Could you take a look at this?

[isaak654]

@lufog Reported in issue #655.