Added Bulgaran Readme + Fix my older writing style of the bulgarian translatation in strings.xml (#273)

* Added Bulgaran Readme (By boyan)

* manager: improved mount system info fetching logic

* UPDATE BULGARIAN STRINGS.xml

no questions asked

---------

Co-authored-by: rifsxd <rifat.44.azad.rifs@gmail.com>
Co-authored-by: Rifat Azad <33044977+rifsxd@users.noreply.github.com>

manager/app/src/main/java/com/rifsxd/ksunext/ui/screen/Home.kt

@@ -450,7 +450,7 @@ private fun InfoCard() {
                 content = currentMountSystem().ifEmpty { stringResource(R.string.unavailable) },
                 icon = Icons.Filled.SettingsSuggest,
             )
-
+            
             val suSFS = getSuSFS()
             if (suSFS == "Supported") {
                 val isSUS_SU = getSuSFSFeatures() == "CONFIG_KSU_SUSFS_SUS_SU"