The language you select for your document determines the dictionary used for spell check, thesaurus and hyphenation, the decimal and thousands delimiter used and the default currency format.
Choose Tools - Options. Go to Language Settings - Languages.
Under Default languages for documents, select the document language for all newly created documents. If you mark For the current document only, your choice will only apply to the current document. Close the dialogue box with OK.
Place the cursor in the paragraph whose paragraph style you want to edit.
Open the context menu and select Edit Paragraph Style. This opens the Paragraph Style dialogue box.
Select the Font tab.
Select the Language and click OK.
All paragraphs formatted with the current paragraph style will have the selected language.
Select the text to which you want to apply a language.
Choose Format - Character. This opens the Character dialogue box.
Select the Font tab.
Select the Language and click OK.
In Office Calc, choose Format - Cells and proceed accordingly.
Open the Styles window and click on the Character Styles icon.
Click on the name of the character style to which you want to apply a different language.
Then open the context menu in the Styles window and select Modify. This opens the Character Style dialogue box.
Select the Font tab.
Select the Language and click OK.
Now you can apply the character style to your selected text.
Dictionaries are supplied and installed as extensions. Choose Tools - Language - More Dictionaries Online to open the dictionaries page in your default web browser.
Select a dictionary in the list of descriptions. Click the heading in a dictionary description that you want to get.
In the next page, click the Get It icon to download the dictionary extension. Note the folder name to which your browser downloads the file. Download additional dictionaries as you like.
In Office, choose Tools - Extension Manager and click Add to install the downloaded extensions.
After you installed the extensions, you should close Office (including the Quickstarter), and restart.
A standard installation of Office software will give you a user interface (UI) of your chosen language.
Most users download the American English version, which gives you US English menu commands and application help. If you want another language for the menus (and for the application help, if available in that language), change the UI language as follows.
Choose Tools - Options - Language Settings - Languages.
Select another UI language in the "User interface" list box.
Click OK and restart Office.
If the list box doesn't list the language that you want, see "Adding More UI Languages".
Close Office software (also close the Quickstarter, if you enabled it).
Run Office installer, choose Modify, then select the language that you would like to install from the Additional user interface languages group.
If you use Office packages maintained by your Linux distribution, follow the steps below.
Close Office software (also close the Quickstarter, if you enabled it).
Open your favourite package manager, look for Office language packs, and install the languages that you would like to use.
If you downloaded Office packages from the main Office Web site, follow the steps below.
Open your web browser and enter https://www.libreoffice.org/download/.
Select and download the correct language pack for your version of Office software.
Close Office software (also close the Quickstarter, if you enabled it).
Install the language pack. Unpack tar.gz file and install the packages according to standard practice on your platform.