Add support for Multilingualization (m17n)

[UuuNyaa]

I create a pull request for Multilingualization (m17n) support. I want native (Japanese and Simplified Chinese) speakers to review it.

Of course, you are welcome to provide translation resources in other languages.

[UuuNyaa]

The following URL is a good reference for translation. https://github.com/blender/blender-translations/tree/master/po

[nagadomi]

If powroupi will merge this PR, I can revise the Japanese translation.

My personal concern is that translations without text_ctxt option will affect blender itself and other addons as well. However, it is not practical to add text_ctxt option to all label(), operator() etc :(

Regarding the Japanese translation, there are no errors at the natural language layer, but I think it would be better to use the same name for the same field as in PMX Editor. (If you only have a Linux machine, you can run PMX Editor on wine 32bit.) For example, 表示パネル→表示枠, 両面表示→両面描画, リジッドボティ→剛体, etc. Some names already have a translation in blender itself and may not be overridable. This also relates to text_ctxt option.

[UuuNyaa]

@nagadomi Thanks for your comment.

I think it would be better to use the same name for the same field as in PMX Editor.

It is a difficult decision. I guess it would be less confusing for users if we adopt Blender's vocabularies. Furthermore, PMX Editor vocabularies cannot be referenced in translations of other languages, such as Chinese.

[powroupi]

@UuuNyaa, thank you, the changes looks great, and I think I'll merge this PR when your changes are all done. Thank you very much. :smile:

My personal concern is that translations without text_ctxt option will affect blender itself and other addons as well.

I'm not sure how translations affect other UI. Shouldn't it only affect the UI of mmd_tools since we register it with our addon's name? :thinking:

[nagadomi]

@UuuNyaa I guess it would be less confusing for MMD modelers if we adopt PMX Editor's vocabularies. Also, mmd_tools is a PMX Format editing tool, and I believe that the field names related to PMX Format used by mmd_tools are English translations of the Japanese field names in PMX Editor (official software of PMX format). However, this is not a very strong opinion, because the meaning of the field names is understandable in the current situation.

@powroupi As far as I know, it affects all translatable UI parts. This may be old knowledge, but it has probably not changed. The reason for specifying the addon's name is to unregister the dictionary set registered with that name.

[UuuNyaa]

@nagadomi

I guess it would be less confusing for MMD modelers if we adopt PMX Editor's vocabularies.

You are also right. At least I can say is that whichever vocabulary we adopt will be better than the current one. If more people get confused, we can solve the problem by list or pop-up both vocabularies in the future.

@powroupi

I'm not sure how translations affect other UI.

The following is an example of how translation affects other UIs.

Multiply is translated into 正片叠底(相乘 A*B) (means Positive Overlay (Multiply A*B)), which results in a strange display even in different contextual situations. We cannot override this official translation without specifying the context (text_ctxt). 😟

[powroupi]

Okay, I see. I think we don't need to translate some common/simple vocabularies which already can be translated well by Blender such as Apply, Clear,... . Currently, It should be enough to translate only those vocabularies which would not be translated by Blender. If we want to translate other vocabularies that conflict with Blender or other addons, we should look for another way.

@UuuNyaa, let me know if your changes are done, I'll merge it then. Thank you. :smile:

[UuuNyaa]

@powroupi Changes are completed. Please merge it.

[powroupi]

I've merged it. Thank you.:smile: