Update Simplified Chinese translation && Fixed translations in other languages

Update Simplified Chinese translation and Fixed translations in other languages

in meld/resources/gtk/menus.ui line 26 is : "Save As…" … It's a symbol with three ellipsis. There's only one symbol

but the many po files is "Save As..." ... This is a symbol of three ellipsis. Here are three symbols

This leads to the problem that the translation of Po files in many languages is not effective

You can't see the difference between the two symbols on this page, but you can see the difference in the code