static @NotNull @Nls String getApplyActionText(@NotNull UnifiedDiffViewer viewer, @NotNull Side sourceSide) {
    String customValue = DiffUtil.getUserData(viewer.getRequest(), viewer.getContext(),
                                              sourceSide.select(DiffUserDataKeysEx.VCS_DIFF_ACCEPT_LEFT_ACTION_TEXT,
                                                                DiffUserDataKeysEx.VCS_DIFF_ACCEPT_RIGHT_ACTION_TEXT));
    if (customValue != null) return customValue;

    return sourceSide.isLeft() ? DiffBundle.message("action.presentation.diff.revert.text")
                               : DiffBundle.message("action.presentation.diff.accept.text");
  }
static @NotNull @Nls String getApplyActionText(@NotNull UnifiedDiffViewer viewer, @NotNull Side sourceSide)