Fix plural form of translations.

The leading '_n: ' should not be part of the translations.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

translations/messages/fr.po

@@ -236,7 +236,7 @@ msgid ""
 "_n: This BibTeX file contains 1 element.\n"
 "This BibTeX file contains %n elements."
 msgstr ""
-"_n: Ce fichier BibTeX contient 1 élément.\n"
+"Ce fichier BibTeX contient 1 élément.\n"
 "Ce fichier BibTeX contient %n éléments."
 
 #: documentwidget.cpp:610
@@ -949,7 +949,7 @@ msgid ""
 "_n: , but only first letter of each last name\n"
 ", but only first %n letters of each last name"
 msgstr ""
-"_n: , mais seulement la première lettre du nom de famille\n"
+", mais seulement la première lettre du nom de famille\n"
 ", mais seulement les %n premières lettres du nom de famille"
 
 #: idsuggestions.cpp:340 idsuggestions.cpp:352
@@ -978,7 +978,7 @@ msgid ""
 "_n: , but only first letter of each word\n"
 ", but only first %n letters of each word"
 msgstr ""
-"_n: , mais seulement la première lettre de chaque mot\n"
+", mais seulement la première lettre de chaque mot\n"
 ", mais seulement les %n premières lettres de chaque mot"
 
 #: idsuggestions.cpp:355

translations/messages/it.po

@@ -2096,7 +2096,7 @@ msgid ""
 "_n: 1 keyword has been imported.\n"
 "%n keywords have been imported."
 msgstr ""
-"_n: 1 parola chiave è stata importata.\n"
+"1 parola chiave è stata importata.\n"
 "%n parole chiave sono state importate."
 
 #: settingskeyword.cpp:131