Here's the easy steps to implement GS' subroutine suggestion ..
(Thought it was a good suggestion by GS, btw)

Install GS' sub into a regular module as below:
In your excel file:
1. Press Alt+F11 to go to VBE
In VBE, click Insert > Module
Copy n paste GS' sub into the code window
(everything within the dotted lines from line: Sub transla() ... to the
line: End sub, as indicatively shown below. Go back to GS' response to do the
actual copying)

'----------
Sub transla()
...
End sub
'---------

Press Alt+Q to get back to Excel

2. In Excel,
a. Insert a new sheet, name it as: xlator
List the text that you want to find in col A, and the corresponding text to
replace it with in col B

b. Go to the sheet that you have the text to be found n replaced all at one
go. Rename the sheet as: Sheet2

Alternatively, you could go back to VBE and amend this line in the sub to
reflect your actual sheetname:

Sheets("Sheet2").Activate

c. Press Alt+F8 to bring up the Macro dialog
Either double-click directly on "transla" inside the window,
or select "transla", click Run, to run the sub.

Last but not least, do go back to GS' response and click the "Yes" button.