GUI: fixed URLs for password reset application

- PwdReset URL can now be set in perun-web-gui.properties, then only single
  URL is used. If value not set in config file, then calculate relative URL from
  hostname and authz type.

Following properties may be optionally added to perun-web-gui.properties before
this commit can be merged:

getPasswordResetUrl = [URL to pwd-reset application]
Merge pull request #225 from zlamalp/pwdreset

GUI: fixed URLs for password reset application
GUI: disabled translation for PerunWeb and PasswordReset

- We do not plan to translate PerunWebGui or PasswordReset,
  so we can use only default language (English) and save up
  many compilation permutations (6 dev / 10 prod).
Merge pull request #226 from zlamalp/lang

GUI: disabled translation for PerunWeb and PasswordReset