C++ Coding Style

Refer to coding-style.md

I18N

update the .ts files

    make update-ts

Add a new language

1. add the language to the LANGUAGES variable in CMakeLists.txt

    SET(LANGUAGES zh_CN xx_YY)

2. make update-ts

3. add a line to seafile-client.qrc

    <file>i18n/seafile_xx_YY.qm</file>

Add a New Language Contributed by Others

1. add the language to the LANGUAGES variable in CMakeLists.txt

    SET(LANGUAGES zh_CN xx_YY)

2. add a line to seafile-client.qrc

    <file>i18n/seafile_xx_YY.qm</file>