Translate PwdHash Sidebar to all the languages!

[quassy]

To localize PwdHash Sidebar, copy one of the folders inside ./locales/, rename it to the ISO 639-1 code of your language and start translating the strings after "message":. The following languages are a priority

• ar Arabic
• zh Chinese (simplified)
• nl Dutch β
• en English
• fr French
• de German
• el Greek
• hi Hindi/Urdu
• it Italian
• ja Japanese
• pl Polish
• pt Portuguese (Brazilian)
• ru Russian
• es Spanish β

Localized readme files like README.de.md are also desirable but not that important.

[JMCQ87]

Anything more I need to know before getting into nl and fr? Is this still up to date?

Possibly could get into ar, with some help, but I think that one will require code changes, just like Farsi would (which maybe should also be a prio?), because of RTL. ;)

[quassy]

There's nothing particular to consider. A tool like WET or Translate Web-Ext might be handy, even though I haven't used it myself.

Commited the current strings for German and English, beta versions of Dutch and Spanish and a placeholder of Arabic (ebaa224). Also I tested it a bit, RTL languages should not require any code changes except cosmetic ones in CSS (reversing the order of labels and inputs in widescreen mode).