Adding more defaults to language adding form

The issue comes up, when web-server (e.g. Apache) default served charset is not "utf-8". Unfortunately we can't rely on this setting here and this is what is proposed to do:

1. As Default CHARSET for Languages we put utf-8 (will be pre-filled on the form)

2. Always put utf-8 in the HTML when you are adding a NEW language and "<inp2:lang_Field name="Charset"/>" is empty (on the first form load). This will help to prevent default Webserver charset to be applied when

[b]<meta http-equiv="content-type" content="text/html; charset="/>[/b] (EMPTY).

3. Additionally for convenience of saving time I propose to set Default values for:

a. Date Format [same as date ouput]
b. Time Format: [same as time ouput]
c. Decimal Point: .
d. MOVE "Icon URL" and "Icon URL (disabled)" before "User Documentation URL" field - since these are rarely filled with values.