Fix: make text of total production fit displays

in case the total production is larger than 1 MWh, i.e., 1000 kWh, the
text on the respective line becomes too large such that it reaches out
of the display when the screensaver is enabled.

this happens on the small and large displays.

this change switches the number format to a float without decimal places
if the total production is larger or equal to 1000 kWh. this saves a dot
and a digit, making the text short enough to fit the display even when
the screensaver moved the display contents as far to the right as it
does.

src/Display_Graphic.cpp

@@ -33,6 +33,7 @@ static const char* const i18n_current_power_w[] = { "%.0f W", "%.0f W", "%.0f W"
 static const char* const i18n_current_power_kw[] = { "%.1f kW", "%.1f kW", "%.1f kW" };
 static const char* const i18n_yield_today_wh[] = { "today: %4.0f Wh", "Heute: %4.0f Wh", "auj.: %4.0f Wh" };
 static const char* const i18n_yield_total_kwh[] = { "total: %.1f kWh", "Ges.: %.1f kWh", "total: %.1f kWh" };
+static const char* const i18n_yield_total_mwh[] = { "total: %.0f kWh", "Ges.: %.0f kWh", "total: %.0f kWh" };
 static const char* const i18n_date_format[] = { "%m/%d/%Y %H:%M", "%d.%m.%Y %H:%M", "%d/%m/%Y %H:%M" };
 
 DisplayGraphicClass::DisplayGraphicClass()
@@ -236,7 +237,9 @@ void DisplayGraphicClass::loop()
         snprintf(_fmtText, sizeof(_fmtText), i18n_yield_today_wh[_display_language], Datastore.getTotalAcYieldDayEnabled());
         printText(_fmtText, 1);
 
-        snprintf(_fmtText, sizeof(_fmtText), i18n_yield_total_kwh[_display_language], Datastore.getTotalAcYieldTotalEnabled());
+        const float watts = Datastore.getTotalAcYieldTotalEnabled();
+        auto const format = (watts >= 1000)?i18n_yield_total_mwh:i18n_yield_total_kwh;
+        snprintf(_fmtText, sizeof(_fmtText), format[_display_language], watts);
         printText(_fmtText, 2);
         //<=======================