QTranslator ru-en && UTF-8

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I'm trying to translate my application from Russian to English language. As far as my source code contains text in UTF-8 I have added the following lines to my .pro file:

CODECFORTR = UTF-8
CODECFORSRC = UTF-8
TRANSLATIONS += app_en.ts

But when I tried to load and install compiled translation file nothing had happened - application interface was in Russian.
Than I tried to remove the first 2 lines from project file, and application interface was translated correctly. The problem is after these lines were removed my .ts translation file contains unreadable characters instead of russian - so it was very hard to translate it. How to cope with this?

[SGaist]

Hi,

What about if you set only CODECFORTR ?

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@SGaist No, that doesn't help. The problem was solved when I tried to use translation utilities from qt5 packet (previously I was trying to use qt4 utilities). lupdate generated .ts file with correct russian symbols and lrelease compiled loadable .qm file.

[SGaist]

Glad you found out and thanks for sharing !

So you were mixing the tools of the two Qt versions ?

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@SGaist Not quite...I was using lupdate and linguist from the same qt version - 4.8.6. Moreover this - I was trying to generate translation file for two platforms - win10 and ubuntu 15.10 with the same result. So finally I used qt5.6 lupdate to generate .ts file, qt4.8.6 linguist as interface to translate UI and qt5.6 lrelease to compile .qm - that works for me.

[SGaist]

Qt 5.6 should also have linguist so you don't have to use two different version of Qt.

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@SGaist That is true, thanks!