fix: invalid CHARSET placeholder in it.po

CHARSET should be changed to UTF-8 or any real encoding for msgfmt to compile it

Author: vani-tty1

po/it.po

@@ -14,7 +14,7 @@ msgstr ""
 "Language-Team: LANGUAGE <LL@li.org>\n"
 "Language: it\n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=CHARSET\n"
+"Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
 #: data/io.github.vani_tty1.memerist.desktop.in:2 src/meme-window.blp:45

po/memerist.pot

@@ -14,7 +14,7 @@ msgstr ""
 "Language-Team: LANGUAGE <LL@li.org>\n"
 "Language: \n"
 "MIME-Version: 1.0\n"
-"Content-Type: text/plain; charset=CHARSET\n"
+"Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
 #: data/io.github.vani_tty1.memerist.desktop.in:2 src/meme-window.blp:45