Initial class construction

Git/usr/share/nano/po.nanorc

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+## Colouring for PO files.
+
+syntax po "\.pot?$"
+comment "#"
+
+# Comments.
+color green "^#.*$"
+color yellow "Copyright|\(C\)"
+# Header fields.
+color brightred "^\"X-Bugs:.*\"$"
+color brightmagenta "\<(Project\-Id\-Version|Report\-Msgid\-Bugs\-To|Last\-Translator|Language(\-Team)?|X-Bugs|X-Generator|Plural\-Forms)\>"
+color cyan "\<(POT\-Creation\-Date|PO\-Revision\-Date|MIME\-Version|Content\-Type|Content\-Transfer\-Encoding)\>"
+# Encodings and numbers.
+color yellow "\<(UTF|ISO|Windows|Mac|IBM)-[0-9]+"
+color yellow "[0-9]|pre[0-9]|[0-9]bit"
+# Msgids.
+color brightblue "^(msgid|msgid_plural|msgstr)\>"
+# Tags.
+color red " fuzzy(,|$)"
+color yellow " (no-)?[-[:alpha:]]+-format(,|$)"
+# Format specifiers.
+color brightmagenta "%([1-9]\$)?[a-z]*"
+# Quotes and escaped characters.
+color yellow "\""
+color cyan "\\[abcefnrtv"\]"
+# Reminders.
+color brightwhite,yellow "(FIXME|TODO|XXX)"
+# Obsolete strings.
+color red "#~.*"