To change the language settings in different web browsers, follow these steps for each browser:
Google Chrome:
Mac or Linux: Chrome will automatically display in the default system language for your Mac or Linux-based PC. The instructions below are for Windows only.
On your Windows computer, open Chrome.
At the top right, select More (three vertical dots at top-right) > Settings.
On the left, select Languages.
Under "Preferred languages," next to the language you'd like to use, select More (three vertical dots). If the language isn't listed, add it by clicking Add languages.
Select Display Google Chrome in this language.
This option is only available on Windows computers.
Restart Chrome to apply the changes.
More information: https://support.google.com/chrome/answer/173424
Apple Safari:
To change the language in Safari on macOS, you will need to change the system-wide language settings, per the instructions below.
On your Mac, choose Apple menu > System Settings (the second option in the menu), click General in the sidebar, then click Language & Region on the right. (You may need to scroll down.)
Under the Preferred Languages list at the top, do any of the following:
Add a language: Click the Add button, select a language in the list, then click Add (the button in the bottom-right corner).
The list is divided by a separator line. Languages above the line are system languages that are fully supported by macOS and are shown in menus, notifications, websites, and more. Languages below the line aren’t fully supported by macOS, but may be supported by apps that you use, and on some websites.
If you haven’t already added an input source for typing in the language you’re adding, a list of available input sources is shown. If you don’t add an input source now, you can add it later in Keyboard settings.
Change the primary language: Drag a language to the top of the languages list.
Note: You may need to restart your Mac to see the change in all applications. Click Restart Now (the button on the right with red text) to restart your computer.
If macOS, an app, or a website supports the primary language, the user interface is shown in that language. If the language isn’t supported, the next language in the list is used, and so on.
The order of the languages in the list determines how text appears when you type characters in a script that belongs to more than one language. See If non-Latin fonts don’t appear correctly.
If your Mac has multiple users and you want everyone to see the language you chose as the primary language in the login window, click the Settings pop-up menu , then choose Apply to Login Window. (If the Settings pop-up menu doesn’t appear, it means the login window is already set to use the primary language.)
More information: https://support.apple.com/en-asia/guide/mac-help/mh26684/mac
Mozilla Firefox:
Mac:
In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.
In the Language section of the General panel, click Search for more languages in the drop-down menu.
Click Select more languages to add and choose the languages you want to add, then click the Add button.
Use the Move Up and Move Down buttons to change the order, or Remove to pull a language out from the list.
Click OK to save your changes.
Windows:
Click the menu button and select Settings.
In the Language section of the General panel, click Search for more languages in the drop-down menu.
Click Select more languages to add and choose the languages you want to add, then click the Add button.
Use the Move Up and Move Down buttons to change the order, or Remove to pull a language out from the list.
Click OK to save your changes.
More information: https://support.mozilla.org/en-US/kb/use-firefox-another-language
Microsoft Edge:
Go to Settings and more > Settings .
Select Languages from the Settings list.
To add a language to the list of Preferred languages, select Add languages.
Once the language is added, select next to the language, and then choose Display Microsoft Edge in this language.
More information: https://support.microsoft.com/en-us/microsoft-edge/use-microsoft-edge-in-another-language-4da8b5e0-11ce-7ea4-81d7-4e332eec551f