'\r' escape sequence in messages

[Sigra]

Executing the following command (revision 5414) gives the following warning:
$ LANG= utils/buildlocale.py
Generating reference catalogs:
        po/maps/maps.pot
        po/texts/texts.pot
        po/widelands/widelands.pot
        po/win_conditions/win_conditions.pot
        po/scenario_atl01.wmf/scenario_atl01.wmf.pot
        po/scenario_emp01.wmf/scenario_emp01.wmf.pot
        po/scenario_emp02.wmf/scenario_emp02.wmf.pot
        po/scenario_t01.wmf/scenario_t01.wmf.pot
        po/scenario_t02.wmf/scenario_t02.wmf.pot
        po/scenario_t03.wmf/scenario_t03.wmf.pot
        po/scenario_tutorial01.wmf/scenario_tutorial01.wmf.pot
        po/map_plateau.wmf/map_plateau.wmf.pot
        po/tribe_atlanteans/tribe_atlanteans.pot
        po/tribe_barbarians/tribe_barbarians.pot
        po/tribe_empire/tribe_empire.pot
        po/world_blackland/world_blackland.pot
        po/world_desert/world_desert.pot
        po/world_greenland/world_greenland.pot
        po/world_winterland/world_winterland.pot

Compiling translations:
all available.
        eo: ..........
        ca: .
        it: ...................
        cs: ...................
        ar: ...
        ia: .......
        gl: .................
        id: .
        es: ...................
        ru: ..................
        nl: ...................
        pt: .........
        la: ..........po/maps/la.po:129: internationalized messages should not contain the `\r' escape sequence
po/maps/la.po:230: internationalized messages should not contain the `\r' escape sequence
po/maps/la.po:290: internationalized messages should not contain the `\r' escape sequence
....
        nb: .................
        tr: ...
        en_GB: ...................
        fr: ...................
        pt_BR: ...................
        de: ...................
        da: ..................
        fa: .
        fi: ...................
        hu: ...............
        ja: ........
        he: ......po/texts/he.po:63: internationalized messages should not contain the `\r' escape sequence
po/texts/he.po:346: internationalized messages should not contain the `\r' escape sequence
............
        nn: ...
        sr: ...
        oc: ....
        sv: ...................
        sk: ...................
        si: .............
        pl: ...................
        sl: .......
        eu: .

[Jens Beyer (qcumber-some)]

This is already fixed on LP translations (by myself).
I just checked the last translations branch and they don't emit any such warning.

Setting invalid.

[SirVer (sirver)]

Released in build16-rc1