Dim LanguageId As MsoLanguageID

'***************
LanguageId = msoLanguageIDEnglishUK ' Insert the Name or the Value listed at https://learn.microsoft.com/en-us/office/vba/api/word.wdlanguageid.

'***************

' Macro to change language in styles
' Loosely based on a macro posted by Macropod (17 July 2012)
' http://www.vbaexpress.com/forum/showthread.php?42993-Solved-Macro-to-change-all-styles-to-a-specific-languageDim TrackChangesActive As Boolean ' Only possible values are True/False

Dim CheckSpellingAsYouTypeActive As Boolean
Dim CheckGrammarAsYouTypeActive As Boolean
Dim ShowFormatChanges As Boolean
Dim doc As Document
Dim SkipTrackChangesQuestion As Boolean

Dim oDoc As Document, oSty As Style, oStor As Range

Application.ScreenUpdating = False

'Block taken from my personal “MacroSwitchesOff” code
If Options.CheckSpellingAsYouType = True Then CheckSpellingAsYouTypeActive = True Else CheckSpellingAsYouTypeActive = False ' Checks whether CheckSpellingAsYouType is switched on.
Options.CheckSpellingAsYouType = False
' Forces Word to check everything again with the new language. Cancel the above line if you don’t want Word to forget when you’ve “Ignored” a flagged spelling.
' Without switching this setting off and on, Word still underlines words that are correctly written in the new language.
If Options.CheckGrammarAsYouType = True Then CheckGrammarAsYouTypeActive = True Else CheckGrammarAsYouTypeActive = False
Options.CheckGrammarAsYouType = False
' See previous comment

If ActiveDocument.ActiveWindow.View.ShowFormatChanges = True Then ShowFormatChanges = True Else ShowFormatChanges = False
ActiveDocument.ActiveWindow.View.ShowFormatChanges = False
'Check whether Format changes are shown

If ActiveDocument.TrackRevisions = True Then TrackChangesActive = True Else TrackChangesActive = False

If SkipTrackChangesQuestion <> True Then ' Skip the track changes question
If MsgBox("Perform the operation with track changes?", _
vbYesNoCancel) = vbNo Then
ActiveDocument.TrackRevisions = False
Else
ActiveDocument.TrackRevisions = True
End If
End If

Set oDoc = ActiveDocument
With oDoc
For Each oSty In .Styles
StatusBar = oSty
On Error Resume Next
oSty.LanguageId = LanguageId
On Error GoTo 0
Next
End With

With oDoc
For Each oStor In .StoryRanges
StatusBar = "Setting story " & oStor & " to language " & LanguageId
oStor.LanguageId = LanguageId
Next oStor
End With

ActiveDocument.Range.LanguageId = LanguageId ' Uses the normal method, equivalent of pressing ctrl+a and setting the language.

'Block taken from my personal “MacroSwitchesOnAgain” code
' The lines below revert settings to the status they had before the macro was run
If TrackChangesActive = True Then ActiveDocument.TrackRevisions = True
If CheckSpellingAsYouTypeActive = True Then Options.CheckSpellingAsYouType = True
If CheckGrammarAsYouTypeActive = True Then Options.CheckGrammarAsYouType = True
If ShowFormatChanges = True Then ActiveDocument.ActiveWindow.View.ShowFormatChanges = True
ActiveDocument.ActiveWindow.View.ShowFormatChanges = True

Application.ScreenUpdating = True