RecordTimer.py: Reset first_try_prepare on repeating timers

See http://openpli.org/forums/topic/30676-problem-with-a-repeated-timers/

Initially 'first_try_prepare' set to True. So, if current channel isn't the
required one, then RecordTimerEntry.activate() switches to the required
channel. But this method also sets the 'first_try_prepare' variable to
False. So on subsequent recording events RecordTimerEntry.activate() can't
switch to the required channel.
ScanSetup: Add predefined transponders

Thanks Huevos
ChannelSelection: Add option to remove and rename markers

As selecting markers is not available via the normal bouquets lists you
should enable the bouquet edit mode first. Then the new options remove and
rename are available
ChannelSelection: remove a not required mutableList.flushChanges()
ScanSetup: cosmetics by removing space before double quote
Russion translations

By Dima73
Turkish translations

By asiBenlik
Greek Translations

By athoik
English translations

by athoik
Translations: updated po fiels from sources.

Many things seem to have changed. So many things seem to be untranslated
again.
Translators: please chack your translations. The old translations are
still at the bottom of the .po file as comments.
Virtual keyboard: add Greek layout

Thanks to malakudi

Signed-off-by: Mirakels <mirakels@users.sourceforge.net>
Revert "Translations: updated po fiels from sources."

This reverts commit c1dc2f83b91f0ac17d5508e631ac30b679551884.

Some strange issues with multiplural...
Translations: regenerate .po files

Should be ok this time
German Translations

By Frogman
Latvian translations

Signed-off-by: Mirakels <mirakels@users.sourceforge.net>
Add cursor functionality to Virtual Keyboard
VirtualKeyboard: Ensure returned text is encoded in utf-8
Do not show all services for bouquets and alternative edit

Let the user decide where to get the services from and do not choose for
the option that might take the longest time
Optimize vkey_all.png with optpng

Sorry that I forgot this to do yesterday.
Show Channelselection on green button when there are no subservices

Usually the green button is reserved for subservices used by a German
provider. As this is rarely used and there was a request on the forum to
get into the channel selection with the focus on the current channel I
thought that this may give the green button some added value