Office 2013 - Set the Office Language

1-Open any office 2013 application (Word, Excel...)

2-Go Files

3-Click on Options

4-Choose the Editing Language you require to be default in Office

If the desired language has to match the Microsoft Windows, follow the below steps:

1. Click Start > Control Panel.

2. Click  Region and language

3. In the Region and Language dialog box, on the Keyboards and Languages tab, click Change keyboards.

4. In the Text Services and Input Languages dialog box, under Default input language, click the language that you want to use as the default language.

   If the language that you want to use as the default input language is not listed, complete Steps 5 through 8.

5. Under Installed services, click Add.

6. Expand the language that you want to use as the default input language, and then expand Keyboard.

7. Select the check box for the keyboard or Input Method Editor (IME) that you want to use, and then click OK. The language is added to the Default input language list.

   To preview the keyboard layout, click Preview.

8. Under Default input language, click the language that you want to use as the default language.