you could set up a table with three columns, as

tblLabels
LabelName
Language
CaptionText

set LabelName and Language as a combination primary key. you can store
captions for multiple languages here, and the combo primary key will prevent
entering the same language twice for the same caption. so records in the
table would look like

Label1    English    Good morning
Label1    Spanish    Buenos dias
Label2    English    Good night
Label2    Spanish    Buenos noches

then you can loop through a recordset in the form's VBA module to set the
captions, as

   Dim rst As DAO.Recordset, strSQL As String

   strSQL = "SELECT LabelName, CaptionText FROM tblLabels " _
       "WHERE Language = 'Spanish'"

   Set rst = CurrentDb.OpenRecordset(strSQL)
   rst.MoveFirst
   Do
       Me(rst("LabelName")).Caption = rst("CaptionText")
       rst.MoveNext
   Loop Until rst.EOF

   rst.Close
   Set rst = Nothing

the only thing you need to decide is how to change the language name
specified in the SQL statement's WHERE clause.

hth

Open a recordset for the language stuff, then loop through
its records setting the captions.