support: mark fedora 21 as partially supported

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:po: update POTFILES.in

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:po: update translation template

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:po: update Polish translations

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:providers:stubbox: update stubbox POTFILES.in

This patch updates POTFILES.in for stubbox that got out of date after
some renames earlier.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:providers:stubbox: update translation template

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:providers:stubbox: add a bug link

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:providers:stubbox: update Polish translations

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:providers:categories: update POTFILES.in

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:providers:categories: update translation template

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
plainbox:providers:categories: add Polish translations

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
"automatic merge of lp:~zkrynicki/checkbox/fedora-21/ by tarmac [r=roadmr][bug=][author=zkrynicki]"
"automatic merge of lp:~zkrynicki/checkbox/i18n-update/ by tarmac [r=sylvain-pineau][bug=][author=zkrynicki]"