Suppose that Office 2016 Pro Plus (MS ActionPack, MSDN subscription etc.) is installed on your PC but you still need to add some language support. In my case, I need to add the Russian proof tools to the English Office that includes already the French language support but doesn't contain any Cyrillic spell checking.

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Office 365 Japanese Language Pack

If you are using Office 365 or Office 2019, 2016, 2013, or 2010, you need to go to the language accessory pack page from office.com and select your language. Once you see the download link, click on it to start downloading the pack. Step 1: Start by Installing the Language Accessory pack. The language accessory pack files are completely free to download for either the 32-bit (x86) or 64-bit (x64) Office architectures. First, you would need to choose the version of Office you are using, and then select the language that you desire from the drop-down list.

The recommended way is to download the language pack and install it. However, it doesn't work for me, the error 30182-4 is occurred. Unfortunately, none of proposed workarounds don't work for me (repair, full reinstall).

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The solution is to download a language-specific Office ISO (Russian in my case) available for all MS subscribers and install it over existing English Office. Then go to 'Office Language Preferences', add required tools and set options.

Below, you will find a complete list of Office 365 language IDs. All of those languages are supported in Office 365. The list includes a language name in English, in the respective language and a language code (ID) used, for example, as an Active Directory attribute.

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In most cases, you can take a look at the list of available languages in an Office 365 profile. You can go to Settings>Language and time zone and easily scroll through the list. However, there are two problems you might encounter:

In a hybrid environment, you will not be able to see or change available languages. The language is synced using the prefferedLanguage attribute from the on-premises Exchange. That is why you might need one of the language codes from below to set the Exchange attribute. How to change language in Office 365 portal in a hybrid environment?
All language names are written in respective languages. While this is the obvious and preferred choice, it can also be problematic. If you are an English speaking admin and are asked to change the language for a user, it might make an easy task quite problematic. Fortunately, if you use the list of supported Office 365 languages from below, such a task will be a no-brainer.

Languages supported in Office 365

The table below shows all languages supported in an Office 365 environment:

Language and region	Language in English	Language ID (string)
Bahasa Melayu (Brunei)	Malay (Brunei)	ms
Bahasa Melayu (Malaysia)	Malay (Malaysia)	ms
català (català)	Catalan	ca
čeština (Česká republika)	Czech	cs
dansk (Danmark)	Danish	da
Deutsch (Deutschland)	German (Germany)	de
Deutsch (Liechtenstein)	German (Liechtenstein)	de-li
Deutsch (Luxemburg)	German (Luxembourg)	de-lu
Deutsch (Österreich)	German (Austria)	de-at
Deutsch (Schweiz)	German (Switzerland)	de-ch
eesti (Eesti)	Estonian	et
English (Australia)	English (Australia)	en-au
English (Belize)	English (Belize)	en-bz
English (Canada)	English (Canada)	en-ca
English (Hong Kong SAR)	English (Hong Kong SAR)	en
English (India)	English (India)	en
English (Indonesia)	English (Indonesia)	en
English (Ireland)	English (Ireland)	en-ie
English (Jamaica)	English (Jamaica)	en-jm
English (Malaysia)	English (Malaysia)	en
English (New Zealand)	English (New Zealand)	en-nz
English (Philippines)	English (Philippines)	en-ph
English (Singapore)	English (Singapore)	en
English (South Africa)	English (South Africa)	en-za
English (Trinidad and Tobago)	English (Trinidad and Tobago)	en-tt
English (United Kingdom)	English (United Kingdom)	en-gb
English (United States)	English (United States)	en-us
English (Zimbabwe)	English (Zimbabwe)	en-zw
español (Argentina)	Spanish (Argentina)	es-ar
español (Bolivia)	Spanish (Bolivia)	es-bo
español (Chile)	Spanish (Chile)	es-cl
español (Colombia)	Spanish (Colombia)	es-co
español (Costa Rica)	Spanish (Costa Rica)	es-cr
español (Ecuador)	Spanish (Ecuador)	es-ec
español (El Salvador)	Spanish (El Salvador)	es-sv
español (España, alfabetización internacional)	Spanish (International Sort)	es-es
español (Estados Unidos)	Spaniesh (United States)	es-us
español (Guatemala)	Spanish (Guatemala)	es-gt
español (Honduras)	Spanish (Honduras)	es-hn
español (México)	Spanish (Mexico)	es-mx
español (Nicaragua)	Spanish (Nicaragua)	es-ni
español (Panamá)	Spanish (Panama)	es-pa
español (Paraguay)	Spanish (Paraguay)	es-py
español (Perú)	Spanish (Peru)	es-pe
español (Puerto Rico)	Spanish (Puerto Rico)	es-pr
español (República Dominicana)	Spanish (Dominican Republic)	es-do
español (Uruguay)	Spanish (Uruguay)	es-uy
español (Venezuela)	Spanish (Venezuela)	es-ve
euskara (euskara)	Basque	eu
français (Belgique)	French (Belgium)	fr-be
français (Cameroun)	French (Cameroon)	fr
français (Canada)	French (Canada)	fr-ca
français (Congo, République démocratique du)	French (Congo)	fr
français (Côte d’Ivoire)	French (Ivory Coast)	fr
français (France)	French (France)	fr
français (Haïti)	French (Haiti)	fr
français (La Réunion)	French (Reunion Island)	fr
français (Luxembourg)	French (Luxembourg)	fr-lu
français (Mali)	French (Mali)	fr
français (Maroc)	French (Morocco)	fr
français (Monaco)	French (Monaco)	fr-mc
français (Sénégal)	French (Senegal)	fr
français (Suisse)	French (Switzerland)	fr-ch
galego (galego)	Galician	gl
hrvatski (Bosna i Hercegovina)	Croatian (Bosnia and Herzegovina)	hr
hrvatski (Hrvatska)	Croatian (Croatia)	hr
Indonesia (Indonesia)	Indonesian	id
italiano (Italia)	Italian (Italy)	it
italiano (Svizzera)	Italian (Switzerland)	it-ch
latviešu (Latvija)	Latvian	lv
lietuvių (Lietuva)	Lithuanian	lt
magyar (Magyarország)	Hungarian	hu
Nederlands (België)	Dutch (Belgiu

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