Add Greek translation for GD-FYI (#189)

* Translate auxiliary strings to Greek

* Translate index to Greek

* update contacts (el)

* fix a string in index

* Update language menu (EL)

* update lang label for el/index

* Update el/index

* Translate what-is-gender to el

* translate history to el

* Update aux strings (el)

* patch el/history

* translate euphoria to el

* harmonise terms in el/what-is-gender

* translate phys. dysphoria to el

* translate biochem. dysphoria to el

* translate social dysphoria to el/

* translate societal dysphoria to el

* translate sexual dysphoria to el

* correct a word in societal dysphoria el

* translate presentational dysphoria to el

* translate existential dysphoria to el

* translate managed dysphoria to el

* correct typo in en/impostor-syndrome

* translate impostor syndrome to el

* translate am-i-trans to el

* translate diagnoses to el

* translate treatment to el

* translate causes to el

* translate chromosomes to el

* translate hormones to el

* translate theca cell in el/causes.md after verifying official terminology

* fix yaml header in el/hormones.md

* translate second-puberty-masc to el

* Fix incorrect link in en/hormones

* Minor rewording in el/second-puberty-masc

* Minor fixes in el/second-puberty-masc

* translate second-puberty-fem to el

* Commit images not requiring translations to el/

* add el to engines

* replace a cyrillic e with a latin e because i'm an idiot

* Fix minor yaml inconsistencies in el md files

* Add el print step to build.yml

* translate conclusion to el

* translate images to el :')

* translate tweets to el

* Translate untranslated term in el/_images/_steroidogenesis

* Fix detefcted mistakes in el translation (.md)

* Fix detected mistakes in el translation (.md)

* reformat twitter-i18n.json

* correct yaml in second-puberty-fem (el)

templates/language-menu.hbs

@@ -1,5 +1,6 @@
 <div class="dropdown-menu" aria-labelledby="nav-gdb">
   <a href="/de/" class="{{#is page.lang 'de'}}active {{/is}}dropdown-item">Deutsch (German)</a>
+  <a href="/el/" class="{{#is page.lang 'el'}}active {{/is}}dropdown-item">Ελληνικά (Greek)</a>
   <a href="/en/" class="{{#is page.lang 'en'}}active {{/is}}dropdown-item">English</a>
   <a href="/es/" class="{{#is page.lang 'es'}}active {{/is}}dropdown-item">Español (Spanish)</a>
   <a href="/fr/" class="{{#is page.lang 'fr'}}active {{/is}}dropdown-item">Français (French)</a>