Update documentation

LANGUAGE.md

@@ -835,11 +835,12 @@ From lowest to highest priority:
 _;_   _;
 _:=_  _+=_  _-=_  _//=_  _/=_  _*=_  _%=_  _^=_
 _,_
+_=_
 _|_   _&_   _~?_  _~_   _#_
 _!=_  _==_  _>=_  _<=_  _<_   _>_
 _+_   _-_
 _*_   _//_  _/_   _%_
-_::_  _=_
+_::_ 
 -_  !_
 _^_
 _._   _!_
@@ -882,7 +883,7 @@ These only work on numbers.
 
 `a + b`: evaluate a and b, returns their sum.
 
-`-`, `*`, `/`, `//`, `^`: same for substraction, multiplication, division, integer division, exponentiation
+`-`, `*`, `/`, `//`, `^`, `%`: same for substraction, multiplication, division, integer division, exponentiation, modulo
 
 `-a`: evaluate a, returns its opposite
 
@@ -962,6 +963,10 @@ This only works on strings:
 
 `random(...)`: same arguments as before, but execute a random element at every execution.
 
+##### String methods
+
+`len(string)`: returns length of the string in UTF-8 characters
+
 ##### Various
 
 `alias(ref::reference, alias::string)`: define an alias `alias` for the variable or function referenced by `ref`. Expect fully qualified names for the alias.

notes.txt

@@ -99,3 +99,5 @@ Advantages:
 Disadvantages:
 * idk if it's worth the trouble
 * could do something like `$ ()(l::list(?), i::number)::?`, but then can't return nil on not found...
+
+TODO: write a translation guide/simplify translation process