Extend MarkDown_course

<div><p>Enhance Markdown similarly to GitHub flavor.</p> <p>See: - http://en.wikipedia.org/wiki/Markdown#Extensions - https://guides.github.com/features/mastering-markdown/</p> <p>OSMTM use an &#34;old&#34; version of <a href="https://github.com/showdownjs/showdown">showdown</a>. The up to date version support &#34;<a href="https://github.com/showdownjs/showdown/tree/master/src/extensions">extensions</a>&#34;.</p> <p>A lot of GitHub flavor work actually fine, but some useful don&#39;t in OSMTM:</p> <p>| Name | Markdown | Example | | :-- | :-- | :-- | | Strikethrough | <code>~~this is striked~~</code> | ~~this is striked~~ | | Tables | | this text is in a table | | Emoji | <code>:bulb:</code> | :bulb: | | Username | &#96;&#96; | : | | Task Lists | | see below | - [x] Download JOSM Preset - [x] Load imagery - [ ] Load gpx file</p> <p>We could also use the syntax to link issues in github to link to projects in OSMTM <code># 515</code> #515 </p> <p>:gb: <a href="http://tasks.hotosm.org/project/591?_LOCALE_&#61;en">South Sudan Crisis, Cholera outbreak in Juba</a> :warning: Check in the vector data is correctly aligned on Bing imagery</p> <p>:fr: <a href="http://tasks.hotosm.org/project/591?_LOCALE_&#61;fr">Crise au Soudan du Sud, épidémie de choléra à Juba</a> :warning: Vérifier si la donnée vecteur est correctement alignée sur l&#39;imagerie Bing</p><p>该提问来源于开源项目&#xff1a;hotosm/osm-tasking-manager2</p></div>

Missing countries for French language_course

<div><p>Hello, there are 4 missing countries in French version</p> <p>BQ &#61;&gt; Bonaire, Saint-Eustache et Saba CW &#61;&gt; Curaçao SS &#61;&gt; Sud Soudan SX &#61;&gt; Sint Maarten</p> <p>Thanks</p><p>该提问来源于开源项目&#xff1a;umpirsky/country-list</p></div>