Fix typos detected by codespell across codebase

.codespellrc

@@ -0,0 +1,10 @@
+[codespell]
+# Skip translation string files (managed via Weblate), build directories, git, and localized metadata
+skip = ./app/src/main/res/values-*,./fastlane/metadata/android/*,./doc/README.*.md,./.git,./build,./.gradle,./app/build,./captures,./.idea
+
+# Words to ignore (case-insensitive) - common words from other languages and valid technical terms
+ignore-words-list = ser,nam,te,als,ist,unter,som,alle,ned,noe,noen,openen,appen,tre,fane,selv,lastes,ser,vise,sist,aktive,aktiv,tekst,lokale,adres,nowe,teh,sme,stran,mape,buton,complet,normale,modul,ore,sistem,progres,efect,curent,progresive,grup,incluse,apreciate,similare,categorie,elemente,probleme,duplicat,vor,devine,populare,importat,generat,serios,implicite,butoon,serwer,selektor,serwerow,nin,nome,vai,nomes,erro,autor,inicial,utiliza,alternar,posible,nd,ue,meda,nto,subscriprion,fo,mis,trun,cant,optin,goup,heigh,ot,compatability,whats,re-used,co-ordinates,re-using,everytime
+
+# File types to check
+check-hidden = false
+quiet-level = 2

app/src/main/java/org/schabi/newpipe/util/FilenameUtils.kt

@@ -52,7 +52,7 @@ object FilenameUtils {
      * Create a valid filename.
      *
      * @param title the title to create a filename from
-     * @param invalidCharacters patter matching invalid characters
+     * @param invalidCharacters pattern matching invalid characters
      * @param replacementChar the replacement
      * @return the filename
      */

app/src/test/java/org/schabi/newpipe/streams/SrtFromTtmlWriterTest.java

@@ -127,7 +127,7 @@ public class SrtFromTtmlWriterTest {
      * - Reference:
      *   Unicode Basic Latin (https://unicode.org/charts/PDF/U0000.pdf),
      *   ASCII Control (https://en.wikipedia.org/wiki/ASCII#Control_characters).
-     *   and the defination of these characters can be known.
+     *   and the definition of these characters can be known.
      */
     private static final String CONTROL_CHAR_TTML = "<p begin=\"00:00:05.000\" "
             + "end=\"00:00:07.000\">"