Translation fixes

Change "BIOS Address" -> "BIOS address"

Consistency for "KB" in Xi8088 configuration

Fix incorrect source strings and restore their correct translations
that were lost; apply trivial edits

Fix duplicate strings in the Polish translation

src/floppy/fdc_magitronic.c

@@ -110,7 +110,7 @@ static const device_config_t b215_config[] = {
   // clang-format off
     {
         .name           = "bios_addr",
-        .description    = "BIOS Address",
+        .description    = "BIOS address",
         .type           = CONFIG_HEX20,
         .default_string = NULL,
         .default_int    = 0xca000,

src/floppy/fdc_monster.c

@@ -162,7 +162,7 @@ static const device_config_t monster_fdc_config[] = {
 #endif
     {
         .name           = "bios_addr",
-        .description    = "BIOS Address",
+        .description    = "BIOS address",
         .type           = CONFIG_HEX20,
         .default_string = NULL,
         .default_int    = 0xc8000,

src/floppy/fdc_pii15xb.c

@@ -123,7 +123,7 @@ static const device_config_t pii_config[] = {
   // clang-format off
     {
         .name           = "bios_addr",
-        .description    = "BIOS Address",
+        .description    = "BIOS address",
         .type           = CONFIG_HEX20,
         .default_string = NULL,
         .default_int    = 0xce000,