Merge pull request #1 from benwei/develop

Develop
Merge pull request #2 from benwei/develop

[fix] layout of Readme.md
Merge pull request #3 from benwei/develop

[feature] signle file drag and drop to open
Merge pull request #4 from benwei/develop

[fix] the export filename is null
Merge pull request #5 from benwei/develop

Develop
Merge pull request #6 from benwei/develop

[feature] export button at main view
[Localize] try with localized strings
Merge pull request #7 from benwei/feature/l10n

[Localize] try with localized strings