fix: add sincerely to lang.toml

Added "Sincerely" in the coverletter to the list of translated words. Fixes #27

lang.toml

@@ -7,31 +7,36 @@ dear = "Dear"
 cover-letter = "Cover Letter"
 attached = "Attached"
 curriculum-vitae = "Curriculum Vitae"
+sincerely = "Sincerely"
 
 [lang.de]
 resume = "Lebenslauf"
 dear = "Sehr geehrte"
 cover-letter = "Anschreiben"
 attached = "Angehängt"
 curriculum-vitae = "Lebenslauf"
+sincerely = "Aufrichtig"
 
 [lang.gr]
 resume = "Βιογραφικό"
 dear = "Αγαπητέ"
 cover-letter = "Συνοδευτική Επιστολή"
 attached = "Συνημμένο"
 curriculum-vitae = "Βιογραφικό"
+sincerely = "Με εκτίμηση"
 
 [lang.pt]
 resume = "Currículo"
 dear = "Caro(a)"
 cover-letter = "Carta de Apresentação"
 attached = "Em anexo"
 curriculum-vitae = "Currículo"
+sincerely = "Atenciosamente"
 
 [lang.sp]
 resume = "Currículum"
 dear = "Estimado"
 cover-letter = "Carta de Presentación"
 attached = "Adjunto"
 curriculum-vitae = "Currículum"
+sincerely = "Sinceramente"

lib.typ

@@ -601,7 +601,7 @@
   let letter-conclusion = {
     align(bottom)[
       #pad(bottom: 2em)[
-        #text(weight: "light")[Sincerely,] \
+        #text(weight: "light")[#linguify("sincerely", from: lang_data)#sym.comma] \
         #text(weight: "bold")[#author.firstname #author.lastname] \ \
         #text(weight: "light", style: "italic")[ #linguify(
             "attached",