ox: Add translations for Islandic

* lisp/ox.el (org-export-dictionary): Add translations for Islandic.

Suggested-by: Jón Gunnar Þorsteinsson <jongth@hi.is>

lisp/ox.el

@@ -5597,6 +5597,7 @@ them."
      ("es" :ascii "Ecuacion" :html "Ecuación" :default "Ecuación")
      ("et" :html "Võrrand" :utf-8 "Võrrand")
      ("fr" :ascii "Equation" :default "Équation")
+     ("is" :default "Jafna")
      ("ja" :default "方程式")
      ("no" :default "Ligning")
      ("nb" :default "Ligning")
@@ -5611,6 +5612,7 @@ them."
      ("de" :default "Abbildung")
      ("es" :default "Figura")
      ("et" :default "Joonis")
+     ("is" :default "Mynd")
      ("ja" :default "図" :html "図")
      ("no" :default "Illustrasjon")
      ("nb" :default "Illustrasjon")
@@ -5625,6 +5627,7 @@ them."
      ("es" :default "Figura %d:")
      ("et" :default "Joonis %d:")
      ("fr" :default "Figure %d :" :html "Figure %d :")
+     ("is" :default "Mynd %d")
      ("ja" :default "図%d: " :html "図%d: ")
      ("no" :default "Illustrasjon %d")
      ("nb" :default "Illustrasjon %d")
@@ -5677,6 +5680,7 @@ them."
      ("es" :ascii "Indice de tablas" :html "Índice de tablas" :default "Índice de tablas")
      ("et" :default "Tabelite nimekiri")
      ("fr" :default "Liste des tableaux")
+     ("is" :default "Töfluskrà" :html "Töfluskrá")
      ("ja" :default "表目次")
      ("no" :default "Tabeller")
      ("nb" :default "Tabeller")
@@ -5733,6 +5737,7 @@ them."
      ("es" :default "Tabla")
      ("et" :default "Tabel")
      ("fr" :default "Tableau")
+     ("is" :default "Tafla")
      ("ja" :default "表" :html "表")
      ("pt_BR" :default "Tabela")
      ("ru" :html "Таблица"
@@ -5744,6 +5749,7 @@ them."
      ("es" :default "Tabla %d")
      ("et" :default "Tabel %d")
      ("fr" :default "Tableau %d :")
+     ("is" :default "Tafla %d")
      ("ja" :default "表%d:" :html "表%d:")
      ("no" :default "Tabell %d")
      ("nb" :default "Tabell %d")