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/usr/share/gtksourceview-3.0/language-specs/po.lang is in libgtksourceview-3.0-common 3.10.2-0ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--

 This file is part of GtkSourceView

 Author: Paolo Maggi
 Copyright (C) 2003 Paolo Maggi

 GtkSourceView is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 GtkSourceView is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

-->
<language id="gettext-translation" _name="gettext translation" version="2.0" _section="Others">
  <metadata>
    <property name="mimetypes">text/x-po;text/x-pot;text/x-pox;text/x-gettext-translation;text/x-gettext-translation-template</property>
    <property name="globs">*.po;*.pot</property>
    <property name="line-comment-start">#</property>
  </metadata>

  <styles>
    <style id="comment"   _name="Comment"       map-to="def:comment"/>
    <style id="location"  _name="Location"      map-to="def:comment"/>
    <style id="string"    _name="String"        map-to="def:string"/>
    <style id="fuzzy"     _name="Fuzzy"         map-to="def:note"/>
    <style id="keyword"   _name="Keyword"       map-to="def:keyword"/>
    <style id="format"    _name="String Format" map-to="def:special-char"/>
  </styles>

  <definitions>
    <context id="string" style-ref="string" class="string" class-disabled="no-spell-check">
      <start>"</start>
      <end>"</end>
      <include>
        <context ref="def:escape"/>
        <context ref="def:line-continue"/>
        <context ref="def:email-address"/>
        <context ref="def:net-address"/>
        <context id="mnemonic" style-ref="format">
          <match>[&amp;_][\p{L}\p{Nd}]</match>
        </context>
        <context id="tag" style-ref="format">
          <match>&lt;[a-zA-Z\=\"\/ ]+&gt;</match>
        </context>
        <context ref="python:format" style-ref="format"/>
        <context ref="c:printf" style-ref="format"/>
      </include>
    </context>
    <context id="format" style-ref="comment" end-at-line-end="true">
      <start>^#,</start>
      <include>
        <context ref="def:escape"/>
        <context ref="def:line-continue"/>
        <context id="fuzzy" style-ref="fuzzy">
          <match>\bfuzzy\b</match>
        </context>
      </include>
    </context>
    <context id="location" style-ref="location" end-at-line-end="true">
      <start>^#:</start>
      <include>
        <context ref="def:escape"/>
        <context ref="def:line-continue"/>
      </include>
    </context>
    <context id="keyword" style-ref="keyword">
      <prefix>^</prefix>
      <keyword>domain</keyword>
      <keyword>msgid</keyword>
      <keyword>msgid_plural</keyword>
      <keyword>msgstr</keyword>
      <keyword>msgctxt</keyword>
    </context>
    <context id="gettext-translation" class="no-spell-check">
      <include>
        <context ref="string"/>
        <context ref="format"/>
        <context ref="location"/>
        <context ref="def:shell-like-comment"/>
        <context ref="keyword"/>
      </include>
    </context>
  </definitions>
</language>