Localize the installer

This makes it possible for the admin to choose their preferred language in the first step of the installer. That choice applies to the rest of the installation process and is set as the default system language in the config file.

Notes:
 * only the languages with a translated Install.php file will be presented for choosing
 * the locale for the default admin account is still being set to en-US for some reason
 * this doesn't update the templates used in the installer, which aren't fully localizable at the moment.

See merge request !47

fix #125 double save press

See merge request !40

Add lead convert event

we need to know when a lead is converted so we can take various custom actions, but there isn't an event triggered ref #108

See merge request !32

Fix settings links

ref #109 set the linkto field correctly on older migrated systems

See merge request !33

change the default media type to all so that printing is improved ref #127

setting the default media type means that css files get loaded on printing, specific @media changes might be worth doing to improve the printing layout but CSS files  should be loaded by default unless they are explicitly not for a particular media type.

See merge request !41

Fix #126

just a proposal, idea taken from user preference edit js

See merge request !43

removed conditions which checked for a parameter which never existed.

#159

See merge request !51

improved logging, fixes issue #174

See merge request !52

fix #135 set default values on organisations/contacts/opportunities when converting leads

sets the default values for fields before doing the mapped values from the lead conversion mapping.

See merge request !48

fix #124 add to phone lookup table on import

See merge request !42

Use LBL_EQ_ZERO instead of LBL_NO for "No matches" message

There's still one place left where LBL_NO wasn't replaced with LBL_EQ_ZERO.

See merge request !45

Added support for Windows-125* character sets in CSV import.

Excel still does not export CSV as UTF-8, using the 8-bit system character set instead, so support for these charsets comes in handy.
This also updates the `convertCharacterEncoding()` function to be a bit smarter when choosing its backend.

See merge request !46

This makes it possible for the admin to choose their preferred language in the first step of the installer. That choice applies to the rest of the installation process and is set as the default system language in the config file.

Excel still does not export CSV as UTF-8, using the 8-bit system character set instead, so support for these charsets comes in handy.
This also updates the `convertCharacterEncoding()` function to be a bit smarter when choosing its backend.

fix #118 progress indicator alignment

See merge request !38

store a cache of converted html so that we don't convert the same thing multiple times ref #7

See merge request !37

Fix default sort ref #110

this adds code to the model for list views and related list views so that if no sort order is manually specified (someone hasn't clicked a column header) then it checks to see if the performance preference for default sorting is turned on and uses the sort order specified for the module. ref issue #110

See merge request !34

if the preference LISTVIEW_DEFAULT_SORTING is specified then use it for list views and related lists