Plenty chinese i18n ts files and code modification

[u8621011]

trafficstars

Below is what this PR includes

1. traditional/simplified Chinese translation files
2. i18n related cmake script for loadable module
3. i18n related code fixes.

[pieper]

I haven't reviewed in detail, but in principle this looks great!

I'd be mostly concerned about unintended side effects, so maybe we could find a way to generate to packages from this branch that people can test thoroughly.

[jcfr]

I rebased and re-organize the changes.

I will add comment directly on each commit

[jcfr]

A lot of the changes have been reviewed, fixed and integrated. Including support for Qt5.

Remaining changes to review are the one in this PR

[jcfr]

Few runtime issues:

• failed to initialize the dataprobe module: No Data Probe frame - cannot create DataProbe
• And few file that failed to be loaded in the translator:

The File  "qSlicerBaseQTCore_zh_cn.qm"  hasn't been loaded in the translator
The File  "qSlicerBaseQTApp_zh_cn.qm"  hasn't been loaded in the translator
The File  "SubjectHierarchy_zh_cn.qm"  hasn't been loaded in the translator
The File  "VolumeRendering_zh_tw.qm"  hasn't been loaded in the translator

Few more things we need to address:

• CLI module translation:
  • I envision that we would distribute a file named like <modulename>_zh_cn.qm.ts. We should then update https://github.com/Slicer/SlicerExecutionModel to ensure the logic generating and installing the translation files is used by the macro SEMMacroBuildCLI
• distribution of *.qm files within Slicer extension
• translation of text from vtk and mrml objects. I suggest to investigate the use of QT_TRANSLATE_NOOP

Otherwise, I was able to start Slicer built with Qt5: