Unable to build pl translations

[Sylvain Pineau]

Launchpad mis-identifies a translatable strings as being both python-% and python-{ format.

The string in question looks like this:
"blah blah {0}% c"

Launchpad sees it as both {0} and % c string. It adds two flags that are subsequently verified at the build process. The problem is that the translation doesn't retain the trailing 'c' character (as this is not a part of the format, c is just a regular word there) and then "msgfmt --check" reports an error.

(Original bug description below)

The packages refuse to build because of the following error:

# Build i18n catalogs for plainbox and bundled providers
./support/build-i18n -d plainbox/po/
plainbox/po/de.po:7: warning: header field 'Language' missing in header
plainbox/po/en_AU.po:7: warning: header field 'Language' missing in header
plainbox/po/en_CA.po:7: warning: header field 'Language' missing in header
plainbox/po/en_GB.po:7: warning: header field 'Language' missing in header
plainbox/po/es.po:7: warning: header field 'Language' still has the initial default value
plainbox/po/ja.po:7: warning: header field 'Language' missing in header
plainbox/po/pl.po:1221: 'msgstr' is not a valid Python format string, unlike 'msgid'. Reason: The string ends in the middle of a directive.
msgfmt: found 1 fatal error
Location of po/ directory: plainbox/po/
Gettext Domain: plainbox
Existing translations for the following languages:
- de
- en_AU
- en_CA
- en_GB
- es
- ja
- pl
- pt
- ru
- tr
- uk
- zh_TW
Building all translation catalogs
Building translation catalog for: de
Building translation catalog for: en_AU
Building translation catalog for: en_CA
Building translation catalog for: en_GB
Building translation catalog for: es
Building translation catalog for: ja
Building translation catalog for: pl
Unable to build translations for: pl

[Sylvain Pineau (sylvain-pineau)]

See https://code.launchpad.net/~checkbox-dev/+archive/ubuntu/testing/+build/7316365