diff --git a/app/src/main/res/values-es-rUS/strings.xml b/app/src/main/res/values-es-rUS/strings.xml
index e6c05d88..a677129b 100644
--- a/app/src/main/res/values-es-rUS/strings.xml
+++ b/app/src/main/res/values-es-rUS/strings.xml
@@ -3,4 +3,130 @@
     <string name="app_launcher_name">Calculadora</string>
     <string name="scientific_calculator">Calculadora Científica</string>
     <string name="unit_converter">Convertidor de unidades</string>
+    <string name="swap_units">Intercambiar unidades</string>
+    <string name="formula_divide_by_zero_error">Error: división por cero</string>
+    <string name="history">Historial</string>
+    <string name="history_empty">El historial está vacío</string>
+    <string name="clear_history">Limpiar</string>
+    <string name="history_cleared">El historial ha sido limpiado</string>
+    <string name="vibrate_on_button_press">Vibrar al pulsar el botón</string>
+    <string name="unit_length">Longitud</string>
+    <string name="unit_length_kilometer">Kilómetros</string>
+    <string name="unit_length_meter">Metros</string>
+    <string name="unit_length_centimeter">Centímetros</string>
+    <string name="unit_length_millimeter">Milímetros</string>
+    <string name="unit_length_micrometer">Micrometros</string>
+    <string name="unit_length_nanometer">Manómetros</string>
+    <string name="unit_length_angstrom">Ángstroms</string>
+    <string name="unit_length_mile">Millas</string>
+    <string name="unit_length_yard">Yardas</string>
+    <string name="unit_length_foot">Pies</string>
+    <string name="unit_length_inch">Pulgadas</string>
+    <string name="unit_length_fathom">Brazas</string>
+    <string name="unit_length_nautical_mile">Millas Náuticas</string>
+    <string name="unit_length_astronomical_unit">Unidad astronómica</string>
+    <string name="unit_length_parsec">Parsecs</string>
+    <string name="unit_length_light_year">Años Luz</string>
+    <string name="unit_area">Áreas</string>
+    <string name="unit_area_square_kilometer">Kilómetro cuadrado</string>
+    <string name="unit_area_square_meter">Metros cuadrados</string>
+    <string name="unit_area_square_centimeter">Centímetros Cuadrados</string>
+    <string name="unit_area_square_millimeter">Milímetros cuadrados</string>
+    <string name="unit_area_square_mile">Millas cuadradas</string>
+    <string name="unit_area_square_yard">Yardas Cuadradas</string>
+    <string name="unit_area_square_foot">Pies Cuadrados</string>
+    <string name="unit_area_square_inch">Pulgadas Cuadradas</string>
+    <string name="unit_area_acre">Acres</string>
+    <string name="unit_area_hectare">Hectáreas</string>
+    <string name="unit_volume">Volumen</string>
+    <string name="unit_volume_cubic_meter">Metros Cúbicos</string>
+    <string name="unit_volume_cubic_decimeter">Díctímetros Cúbicos</string>
+    <string name="unit_volume_cubic_centimeter">Centímetros Cúbicos</string>
+    <string name="unit_volume_cubic_millimeter">Milímetros Cúbicos</string>
+    <string name="unit_volume_liter">Litros</string>
+    <string name="unit_volume_centiliter">Centilitros</string>
+    <string name="unit_volume_deciliter">Decilitros</string>
+    <string name="unit_volume_milliliter">Mililitros</string>
+    <string name="unit_volume_acre_foot">Pies de Agua</string>
+    <string name="unit_volume_cubic_foot">Pies Cúbicos</string>
+    <string name="unit_volume_cubic_inch">Pulgadas Cúbicas</string>
+    <string name="unit_volume_barrel_us">Barril(US)</string>
+    <string name="unit_volume_gallon_us">Galón (US)</string>
+    <string name="unit_volume_quart_us">Cuarto (US)</string>
+    <string name="unit_volume_pint_us">Pinta (US)</string>
+    <string name="unit_volume_legal_cup_us">Copa Legal (US)</string>
+    <string name="unit_volume_customary_cup_us">Taza (US)</string>
+    <string name="unit_volume_gill_us">Gill (US)</string>
+    <string name="unit_volume_fluid_ounce_us">Onza líquida (US)</string>
+    <string name="unit_volume_barrel_imperial">Barril (Imperial)</string>
+    <string name="unit_volume_gallon_imperial">Galón (Imperial)</string>
+    <string name="unit_volume_quart_imperial">Cuarto (Imperial)</string>
+    <string name="unit_volume_pint_imperial">Pinta (Imperial)</string>
+    <string name="unit_volume_gill_imperial">Gill (Imperial)</string>
+    <string name="unit_volume_fluid_ounce_imperial">Onza Fluida (Imperial)</string>
+    <string name="unit_mass">Masa</string>
+    <string name="unit_mass_gram">Gramos</string>
+    <string name="unit_mass_kilogram">Kilogramos</string>
+    <string name="unit_mass_milligram">Miligramos</string>
+    <string name="unit_mass_microgram">Microgramos</string>
+    <string name="unit_mass_tonne">Tonelada</string>
+    <string name="unit_mass_pound">Libras</string>
+    <string name="unit_mass_ounce">Onzas</string>
+    <string name="unit_mass_grain">Granos</string>
+    <string name="unit_mass_dram">Dracma</string>
+    <string name="unit_mass_stone">Piedra</string>
+    <string name="unit_mass_long_ton">Tonelada Larga</string>
+    <string name="unit_mass_short_ton">Tonelada corta</string>
+    <string name="unit_mass_carat">Quilates</string>
+    <string name="unit_mass_carat_metric">Quilates (Métricos)</string>
+    <string name="unit_temperature">Temperatura</string>
+    <string name="unit_temperature_celsius">Celsius</string>
+    <string name="unit_temperature_fahrenheit">Fahrenheit</string>
+    <string name="unit_temperature_rankine">Rankine</string>
+    <string name="unit_temperature_kelvin">Kelvin</string>
+    <string name="unit_time">Tiempo</string>
+    <string name="unit_time_hour">Horas</string>
+    <string name="unit_time_minute">Minutos</string>
+    <string name="unit_time_second">Segundos</string>
+    <string name="unit_time_millisecond">Milisegundos</string>
+    <string name="unit_time_day">Días</string>
+    <string name="unit_time_week">Semanas</string>
+    <string name="unit_time_year">Años</string>
+    <string name="unit_speed">Velocidad</string>
+    <string name="unit_speed_meter_per_second">Metros por segundo</string>
+    <string name="unit_speed_kilometer_per_second">Kilómetros por segundo</string>
+    <string name="unit_speed_kilometer_per_hour">Kilómetros por hora</string>
+    <string name="unit_speed_mile_per_hour">Millas por hora</string>
+    <string name="unit_speed_knot">Nudos</string>
+    <string name="unit_speed_foot_per_second">Pies por segundo</string>
+    <string name="unit_speed_mach">Mach</string>
+    <string name="unit_speed_speed_of_light">Velocidad de la luz</string>
+    <string name="unit_pressure">Presión</string>
+    <string name="unit_pressure_pascal">Pascales</string>
+    <string name="unit_pressure_kilopascal">Kilopascales</string>
+    <string name="unit_pressure_megapascal">Megapascales</string>
+    <string name="unit_pressure_bar">Bara</string>
+    <string name="unit_pressure_millibar">Bilibara</string>
+    <string name="unit_pressure_atmosphere">Atmósfera</string>
+    <string name="unit_pressure_psi">Libra por pulgada cuadrada</string>
+    <string name="unit_pressure_torr">Torr</string>
+    <string name="unit_pressure_mmhg">Milímetro de mercurio</string>
+    <string name="unit_pressure_inhg">Pulgadas de mercurio</string>
+    <string name="unit_energy">Energía</string>
+    <string name="unit_energy_joule">Joule</string>
+    <string name="unit_energy_kilojoule">Kilojoules</string>
+    <string name="unit_energy_megajoule">Megajoules</string>
+    <string name="unit_energy_gigajoule">Gigajoules</string>
+    <string name="unit_energy_calorie">Calorías</string>
+    <string name="unit_energy_kilocalorie">Kilocaloría</string>
+    <string name="unit_energy_watt_hour">Vatio hora</string>
+    <string name="unit_energy_kilowatt_hour">Kilovatio hora</string>
+    <string name="unit_energy_megawatt_hour">Megavatio hora</string>
+    <string name="unit_energy_electronvolt">Electronvoltio</string>
+    <string name="unit_energy_btu">Unidad térmica británica</string>
+    <string name="unit_energy_therm">Therm</string>
+    <string name="unit_energy_foot_pound">Pie-libra</string>
+    <string name="unit_energy_erg">Ergio</string>
+    <string name="faq_1_title">¿Cómo funciona el botón C (Clear)?</string>
+    <string name="faq_1_text">Al tocarla, se elimina un campo a la vez. Al mantenerla presionada, se reinician todos los campos a la vez.</string>
 </resources>
diff --git a/app/src/main/res/values-is/strings.xml b/app/src/main/res/values-is/strings.xml
index 65ea3728..fca6357f 100644
--- a/app/src/main/res/values-is/strings.xml
+++ b/app/src/main/res/values-is/strings.xml
@@ -8,4 +8,104 @@
     <string name="vibrate_on_button_press">Titra þegar pikkað er á takka</string>
     <string name="faq_1_title">Hvernig virkar C (Hreinsa) hnappurinn\?</string>
     <string name="faq_1_text">Með því að pikka á hann verður einn stafur fjarlægður í einu. Haltu inni til þess að endurstilla alla reiti í einu.</string>
+    <string name="app_launcher_name">Reiknir</string>
+    <string name="unit_converter">Einingabreytir</string>
+    <string name="swap_units">Skipta á einingum</string>
+    <string name="unit_length">Einingabreytir</string>
+    <string name="unit_length_kilometer">Kílómeter</string>
+    <string name="unit_length_meter">Meter</string>
+    <string name="unit_length_centimeter">Sentímeter</string>
+    <string name="unit_length_millimeter">Millimeter</string>
+    <string name="unit_length_micrometer">Míkrómeter</string>
+    <string name="unit_length_nanometer">Nanómeter</string>
+    <string name="unit_length_angstrom">Angstrom</string>
+    <string name="unit_length_mile">Míla</string>
+    <string name="unit_length_foot">Fet</string>
+    <string name="unit_length_inch">Tomma</string>
+    <string name="unit_length_fathom">Faðmur</string>
+    <string name="unit_length_nautical_mile">Sjómíla</string>
+    <string name="unit_length_astronomical_unit">Stjarnfræðieining</string>
+    <string name="unit_length_parsec">parsek</string>
+    <string name="unit_length_light_year">Ljósár</string>
+    <string name="unit_area">Svæði</string>
+    <string name="unit_area_square_kilometer">Ferkílómeter</string>
+    <string name="unit_area_square_meter">Fermeter</string>
+    <string name="unit_area_square_centimeter">Fersentímeter</string>
+    <string name="unit_area_square_millimeter">Fermillimeter</string>
+    <string name="unit_area_square_mile">Fermíla</string>
+    <string name="unit_area_square_foot">Ferfet</string>
+    <string name="unit_area_square_inch">Fertomma</string>
+    <string name="unit_area_acre">Ekra</string>
+    <string name="unit_area_hectare">Hektari</string>
+    <string name="unit_volume">Rúmmál</string>
+    <string name="unit_volume_cubic_meter">Rúmmeter</string>
+    <string name="unit_volume_cubic_decimeter">Rúmdesímeter</string>
+    <string name="unit_volume_cubic_centimeter">Rúmsentímeter</string>
+    <string name="unit_volume_cubic_millimeter">Rúmmillimeter</string>
+    <string name="unit_volume_liter">Líter</string>
+    <string name="unit_volume_centiliter">Sentílíter</string>
+    <string name="unit_volume_deciliter">Desilíter</string>
+    <string name="unit_volume_milliliter">Millilíter</string>
+    <string name="unit_volume_acre_foot">Ekrufet</string>
+    <string name="unit_volume_cubic_foot">Rúmfet</string>
+    <string name="unit_volume_cubic_inch">Rúmtomma</string>
+    <string name="unit_volume_barrel_us">Tunna (BNA)</string>
+    <string name="unit_volume_gallon_us">Gallon (BNA)</string>
+    <string name="unit_volume_quart_us">Fjórðungur (BNA)</string>
+    <string name="unit_volume_pint_us">Hálfpottur (BNA)</string>
+    <string name="unit_volume_legal_cup_us">Lögbolli (BNA)</string>
+    <string name="unit_volume_customary_cup_us">Hefðbundinn Bolli (BNA)</string>
+    <string name="unit_volume_fluid_ounce_us">Únsa (BNA)</string>
+    <string name="unit_volume_barrel_imperial">Tunna</string>
+    <string name="unit_volume_gallon_imperial">Gallon</string>
+    <string name="unit_volume_quart_imperial">Fjórðungur</string>
+    <string name="unit_volume_pint_imperial">Hálfpottur</string>
+    <string name="unit_volume_fluid_ounce_imperial">Únsa</string>
+    <string name="unit_mass">Massi</string>
+    <string name="unit_mass_gram">Gramm</string>
+    <string name="unit_mass_kilogram">Kílogramm</string>
+    <string name="unit_mass_milligram">Millígramm</string>
+    <string name="unit_mass_microgram">Míkrógramm</string>
+    <string name="unit_mass_tonne">Tonn</string>
+    <string name="unit_mass_pound">Pund</string>
+    <string name="unit_mass_ounce">Únsa</string>
+    <string name="unit_mass_grain">Korn</string>
+    <string name="unit_mass_dram">Dramm</string>
+    <string name="unit_mass_stone">Steinn</string>
+    <string name="unit_mass_long_ton">Langtonn</string>
+    <string name="unit_mass_short_ton">Stutttonn</string>
+    <string name="unit_mass_carat">Karat</string>
+    <string name="unit_mass_carat_metric">Karat (SI)</string>
+    <string name="unit_temperature">Hitastig</string>
+    <string name="unit_temperature_celsius">Celsíus</string>
+    <string name="unit_temperature_fahrenheit">Fahrenheit</string>
+    <string name="unit_time">Tími</string>
+    <string name="unit_time_hour">Klukkustund</string>
+    <string name="unit_time_minute">Mínúta</string>
+    <string name="unit_time_second">Sekúnda</string>
+    <string name="unit_time_millisecond">Millisekúnda</string>
+    <string name="unit_time_day">Dagur</string>
+    <string name="unit_time_week">Vika</string>
+    <string name="unit_time_year">Ár</string>
+    <string name="unit_speed">Hraði</string>
+    <string name="unit_speed_meter_per_second">Metrar á sekúndu</string>
+    <string name="unit_speed_kilometer_per_second">Kílómetrar á sekúndu</string>
+    <string name="unit_speed_kilometer_per_hour">Kílómetrar á klukkustund</string>
+    <string name="unit_speed_mile_per_hour">Mílur á klukkustund</string>
+    <string name="unit_speed_knot">Hnútur</string>
+    <string name="unit_speed_foot_per_second">Fet á sekúndu</string>
+    <string name="unit_speed_mach">Hljóðhraði</string>
+    <string name="unit_speed_speed_of_light">Ljóshraði</string>
+    <string name="unit_pressure">Þrýstingur</string>
+    <string name="unit_pressure_pascal">Pascal</string>
+    <string name="unit_pressure_kilopascal">Kílópascal</string>
+    <string name="unit_pressure_millibar">Millíbar</string>
+    <string name="unit_pressure_atmosphere">Loftþyngd</string>
+    <string name="unit_pressure_psi">Pund á fertommu</string>
+    <string name="unit_pressure_mmhg">Millímetrar kvikasilfurs</string>
+    <string name="unit_pressure_inhg">Tommur kvikasilfurs</string>
+    <string name="unit_energy">Orka</string>
+    <string name="unit_energy_joule">Júl</string>
+    <string name="unit_energy_kilojoule">Kílójúl</string>
+    <string name="unit_energy_megajoule">Megjajúl</string>
 </resources>