style(content): normalise italic markdown syntax in languages pages

Change *italic* to _italic_ for consistency across English and French
languages content pages.

content/en/languages.md

@@ -5,7 +5,7 @@ description: Constructed languages (conlangs) and worldbuilding projects.
 
 # Languages and Worldbuilding
 
-*Conlangs*, short for *constructed languages*, are artificial
+_Conlangs_, short for _constructed languages_, are artificial
 languages created by individuals rather than evolving naturally over
 time. They serve various purposes: international auxiliary languages
 like Esperanto, philosophical experiments like Lojban, fictional
@@ -19,8 +19,8 @@ and for literary projects. My conlanging work is documented on my
 ## Eittlandic
 
 Eittlandic is the language of **Eittland**, a fictional Nordic
-country, born from the question: *what if there was another island
-like Iceland that never got Christianised?*
+country, born from the question: _what if there was another island
+like Iceland that never got Christianised?_
 
 The language derives from Old Norse and has been evolved
 naturalistically towards specific artistic goals. In Eittlandic, the
@@ -38,8 +38,8 @@ Proto-Ñyqy is the proto-language and mother language of the Ñyqy
 language family tree. The documentation is written as an in-universe
 document would be, meaning all cultural and historical references are
 entirely fictional. The writing style draws inspiration from academic
-linguistic work, particularly Benjamin W. Fortson's *Indo-European
-Language and Culture*. The [Proto-Ñyqy
+linguistic work, particularly Benjamin W. Fortson's _Indo-European
+Language and Culture_. The [Proto-Ñyqy
 documentation](https://conlang.phundrak.com/proto-nyqy) is publicly
 available online.