Rewrote Japanese help pages

[taku0]

Translated the help pages from English to Japanese.

By the way, the app name in Japanese was defined as "QRコードスキャナー" ("QR Code Scanner" in Japanese) in res/values-ja/strings.xml.
The second commit changes it to "Barcode Scanner". The third commit changes it to "バーコードスキャナー" ("Barcode Scanner" in Japanese).

If "QR Code Scanner" is your intention, I will rewrite the help pages. If you prefer "Barcode Scanner" but not "バーコードスキャナー", ignore the third commit.

If you merge the commits, please also update the app name in Google Play.

[srowen]

Thank you, I'm sure this is a strong improvement.

I think we should leave the app name as-is just because it has been named this way for years. I remember back in 2007 at Google, a native speaker advised us that "QR Code Scanner" would be most readily understood. Yes, it's not quite consistent with the title "Barcode Scanner".

So I will try to apply your first commit.

[srowen]

(PS it is OK to post pull requests here although in the end we work out of https://code.google.com/p/zxing/ primarily)

[taku0]

I agree with him/her (the native speaker at Google). Scanning QR Codes is the most common use case in Japan.
Reverted the second and third commit. Updated help pages.

[srowen]

r2810 in Subversion integrates your first and last commit. Have a look, once it's pulled in to git.

[taku0]

It looks good. There is no problem.

[zxing]

Fixed in r2810.