I know I have been asking a lot of questions but we also have had an issue with translating everything into Dutch. It seems some words are not available yet for translation language xml file. We've updated all words in nl-NL.xml but still found a lot of terms that where not yet translated. I've tried to sum them all up here (hope I didn't make any mistakes and it is clear where all can be found).

Buttonbar alt texts for buttons:

Find and replace
Paste as HTML
Add image map
Break
Insert Row Above
Insert Column to the Left
Insert Column to the Right
Merge Cells Left
Merge Cells Down
Split cells right
Split Cells down
Direction left to right
Direction right to left
Box Formatting
Insert Print page break
Universal Keyboard
Insert groupbox


Dialog windows/Popup windows:

(Search and replace)
Find What
Replace with
Match whole word only
match case
Find next
Replace
Replace All
Annuleren

(spell checker)
Word not in dictoinary
Change to
Suggestions
Word
Ignore
Ignore All
Add
Replace
Replace All
Cancel
Spell Check Complete

(copy button)
Use Ctrl+C

(various paste from windows)
Use CTRL-V on your keyboard to paste the text into the window.
Keep Linebreaks
Clean Up Box
Paste as HTML


(insert link - incl. all tabs like the style builder)
General
Style uiler
Types
Browse
Access Key
Tab Index
Select a named anchor in the current page
Float
General
Style builder
Decoration
Capitalization
Text flow
Indentation
Text Direction
Writing Mode
Height
Tiling
Scrolling
Position
Horizontal
Vertical
Margin
Padding
Style
Position
Display
Float
Clear
Top
Height
Clipping
Bottom
Misc
Page-break-before
Page-break-after

(imagemap)
Please select an image to create an image map

(file uploads / add images / etc)
Upload (max file size allowed )
Max image dimension is
Auto resize uploaded images function is on
Max upload folder size is :
Used:
Height
Constrain Proportions
Horizontal
Vertical
Long description
Count

(colour picker)
Only Web colors
Low
Medium
High

(insert table)
Draw table
Table wizard

(box formatting)
General
Style builder
Marging
Padding
Bottom
Top
Shade
Text-align
Float
-- style builder like previous one

Texts at the bottom of the editor:
Preview
Normal


We also experianced a problem with the length of some of the dropdowns. For example the size dropdown when translated is a lot longer in Dutch. The dropdown then loses it's arrow to the right of it because the size of the word for "size" in dutch is a lot longer and seems to overwrite it.