Set minimal length of Scan and Stop buttons to 6 characters
With English, the "Stop" and "Scan" buttons have the same numbers of letters. Unfortunately with different translation it is different. For example:
- In Polish it is "Stop" and "Skanuj".
- In Chinese is it "停止" and msgstr "扫描".
To do not have too small Scan/Stop button, and to decrease Scan/Stop buttons size differency I have set minimal Scan/Stop button length to 6 characters.