[fix #124] Make default API prefix relative

When using \BlueLaTeX from behind a proxy, if the API prefix is
absolute, then it might lead to some problems because the client send
the request to `/api`.
This is a problem iF \BlueLaTeX is not accessed at the root before
the proxy rewrites the URL.
Merge branch 'satabin-fix/wrong-default-api-path'
Fix file change

The content of the page is not anymore deleted when the user change the
file.
Change default settings of Ace Editor

Change the tab size
Remove key binding of snippet
Improve tooltips translation
Give the focus to the editor when the window is active
Enable french translation
Remove debug data
Fix responsive paper view

Display and hide correctly the left panel
Merge pull request #126 from tdurieux/fix_web_client

Fix and improve the web client
Fix template bibliography stub

The default line to include bibliography must be correct to avoid making
people think it does not work with BibTeX.
Bump dependency versions

Both tiscaf and diffson have been released, the SNAPSHOT versions are no
longer available.
Merge branch 'fix/default-template-bibliography' of github.com:satabin/bluelatex into satabin-fix/default-template-bibliography
Merge branch 'satabin-fix/default-template-bibliography'
Improve the French translation
[fix #127] Improve English translation
Informs user that password is sent by email.

Add a message before registration to inform user that password is sent
by email.
Merge pull request #129 from tdurieux/translation-improve

Improve French and English translation
Merge pull request #130 from tdurieux/mailbox-check-registration

Informs user that password is sent by email.