Added Sourceforge files for translation

https://sourceforge.net/projects/win32diskimager/files/Translations/v1.0/

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To help contribute translations, you can either download the base translation for the current release
(diskimager_en.ts) or clone the entire git repository (see DEVEL.txt). Here are the basic steps:

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Getting Qt:

You will need QT to do the translation. Download it from:
http://download.qt.io/official_releases/online_installers/qt-unified-windows-x86-online.exe

The installation is as follows:
welcome-> next
qt account -> leave all empty, next
setup -> next
installation folder: c:\qt -> next
select components: qt 5.7, deselect all, select minGW 5.3.0 -> next
license Agreement: agree -> next
start menu shortcuts -> next
install
installation finished -> next -> launch

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Add a new translation:

First, install QT as described above.
Next, run QT Linguist from the Windows Start Menu->QT folder.
File -> Open diskimager_en.ts
Edit -> translation file settings, set target language and country/region.
File -> save as Open diskimager_??.ts (where ?? is the region code for your translation).

Translate all the strings into the new language, save the file. To test it, select
File -> Release As and save the resulting diskimager_??.qm to the translations directory where you
installed Win32DiskImager.

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Share your translation:

You can share this easily by uploading the diskimager_??.ts file as an attachment to the Feature Requests,
email me a copy, or if you cloned the git repository, follow the instructions on Sourceforge to fork and do a
merge request.